Ashley was murdered at her home in Leinster Road, Liverpool, caught in the crossfire of a feud between Barry and her boyfriend.
The row began years ago over the theft of drugs, but flared up at Glastonbury last June, where Barry was heard threatening to stab Lee Harrison.
Family handoutCopyright: Family handout
Zeisz was then assaulted by a group, thought to include a friend of Mr Harrison's.
The trial was played voice notes and messages sent by Ashley (seen in this photo at Sefton's Fusion festival with her mum Julie) to her friends in the two months before her death.
Witham admitted manslaughter and claimed he was acting alone - but the prosecution alleged he was the "fall guy", who was trying to protect his co-defendants.
Mr Harrison, who did not co-operate with police following his girlfriend's death, was out on the night of the murder and has since spent time in Dubai, the court heard.
Watch the moment police arrested gunman
The moment gunman James Witham was arrested was captured on camera by officers
He was stopped on 13 September 2022, originally giving the police the false name of Francis Kelly.
Video content
Video caption: Moment James Witham is arrested on suspicion of murderMoment James Witham is arrested on suspicion of murder
The sentences in full
Here's a recap of the sentences handed out at Liverpool Crown Court.
Family handoutCopyright: Family handout
Niall Barry, 26, of Moscow Drive, Tuebrook, was described as the "malign presence" in the murder of Ashley Dale and given a life sentence with at least 47 years behind bars.
Sean Zeisz, 28, of Longreach Road, Huyton, was also handed a life sentence - with a minimum of 42 years - for his role organising and encouraging the shooting of Ashley at her home in Old Swan, Liverpool, in August last year.
Joseph Peers, 29, of Woodlands Road, Roby, Merseyside, who was described as a "foot soldier", was jailed for life with a minimum term of 41 years.
Gunman James Witham, 41, of Ashbury Road, Huyton, Merseyside, was also given a life sentence with a minimum of 43 years.
Tears from the killers' families
Nick Garnett
The four men have now been taken down to the cells.
Sobs of tears can be heard from the public gallery where relatives of the jailed men have been sitting.
'Ashley's family shown dignity throughout'
Nick Garnett
The judge says to Ashley's family: "I have been struck by the dignity you have shown and your personal statements - they were truly remarkable."
He also commended the work of the senior investigating officer Cath Cummings for her work.
BreakingJoseph Peers, 29, sentenced to 41 years
PA MediaCopyright: PA Media
Joseph Peers, 29, has been sentenced to life with a minimum of 41 years.
Peers was described in court as a "foot soldier" after he drove a Hyundai to the scene and earlier helped James Witham to stab the tyres of Ashley's car, in an attempt to lure her and her partner out of the house.
A jury found him guilty of murder, conspiracy to murder Lee Harrison - Ashley's boyfriend - and conspiracy to possess a prohibited weapon.
BreakingSean Zeisz, 28, jailed for life with a minimum of 42 years
PA MediaCopyright: PA Media
Sean Zeisz, 28, has been jailed for life with a minimum term of 42 years for his part in the murder.
A jury found him guilty of murder, conspiracy to murder and conspiracy to possess a prohibited weapon.
Niall Barry, 26, sentenced to 47 years
PA MediaCopyright: PA Media
Niall Barry, 26, has been sentenced to life with a minimum of 47 years for his part in the murder.
Barry and Sean Zeisz, 28, were found to have helped organise and encourage the killing, which came after a feud with Ashley's boyfriend Lee Harrison.
A jury found him guilty of murder, conspiracy to murder Lee Harrison and conspiracy to possess a prohibited weapon.
BreakingAshley Dale's killer, James Witham, sentenced to 43 years
PA MediaCopyright: PA Media
James Witham, 41, has been sentenced to life with a minimum of 43 years for his part in the murder of Ashley Dale.
Ashley was killed when Witham fired a Skorpion sub-machine gun in her house in Liverpool in the early hours of 21 August 2022.
He previously admitted firing the bullet that killed Ashley but claimed it was accidental.
A jury found him guilty of murder, conspiracy to murder Lee Harrison - Ashley's boyfriend - and conspiracy to possess a prohibited weapon.
BreakingAll four jailed for life
Four men jailed for life for murder of Ashley Dale.
All dangerous offenders - judge
Mr Justice Goose tells the four convicted men: "Each of you is a dangerous offender".
BBCCopyright: BBC
Judge about to start sentencing
The judge has begun his remarks and is about to sentence the four men in the dock.
You can watch the judge's sentencing remarks at Liverpool Crown Court by pressing play at the top of the page.
'I wake hoping this is just a bad dream'
Ashley’s paternal grandmother, Susan Steinhilber - known as "Gramma Sue" to Ashley - has also given a moving tribute to the hearing.
She says: "My talented granddaughter Ashley Louise Dale had the world at her feet and I cannot describe how devastated I feel at losing her, and in such a cruel way.
"I wake every morning hoping that this is just a bad dream, but it isn’t, I miss Ashley terribly, who is no longer with us in body but she will always be with us in spirit."
'Their big sister was no longer here'
More from Ashley Dale's mum, Julie, and the words she read out in court.
She recalls the police leaving her house.
"Ashley's two younger sisters were sleeping
peacefully in their beds upstairs, she says.
"Then the reality set in, that I was going to
have to tell them, their big sister they so adored was no longer here.
"Those
poor innocent girls, exposed to this horrific act.
"How can I tell them some
evil person has done this to their defenceless sister who was home alone in her
place of safety."
She said it was a sound "no mother should hear, the screams of my baby
girls when I told them something awful had happened to their big sister, and
she had passed away.
"The inconsolable cries of a seven and 12-year-old, whose
lights had also just been switched off."
Ashley's dad: 'History repeating itself'
The court heard an impact statement from Ashley's dad, Steven Dunne, which described how - since the moment he was told about the killing - he was "confined to a living
nightmare".
"I remember shouting ‘no’ for a long time at the top of my
voice; I couldn’t believe it - history had repeated itself.
Merseyside PoliceCopyright: Merseyside Police
"My son, Lewis Dunne, had been shot dead seven years previous at only 16 years of age.
"He was shot at close range in the back with a shotgun in a case of mistaken identity; an innocent victim caught in the middle of a gang feud.
"It had been a long seven years of pulling myself out of some very dark – and at times, lonely – places, trying to put my life back together."
Continuing with her statement, Ashley's mum says: “My beautiful daughter was now a piece of evidence.”
Mum - 'I hope my words haunt you forever'
Nick Garnett
Witham has now returned to the dock and is drinking from a bottle of water but as the second statement is read out he still refuses to lift his eyes and look at the court.
Shortly before he left the dock, Julie Dale looked at the four men, with Peers and Witham still staring at the floor. She called them monsters, adding: "I hope my words haunt you forever."
Witham leaves dock after words of Ashley's mum hit home
Nick Garnett
Wtiham has walked to the back of the dock.
He couldn’t cope with the words of Julie Dale that were directed to him.
He has left the dock, the judge says he expects him to come back shortly.
The other three defendants are still there.
Barry and Zeisz ran organised crime ring
The prosecution has detailed the criminality of Niall Barry and Sean Zeisz who were also involved in drug crime.
Zeisz and Barry ran an organised crime ring that supplies drugs across large parts of the UK - from north Wales to Brighton
Their messages were intercepted on Encrochat, a messaging system which was hacked by police.
The messages showed they were involved in a gang able to supply large amounts of drugs around the country, and that Barry was able to source firearms when needed.
'Time stood still when I lost my best friend'
Nick Garnett
Julie Dale, Ashley's mum, has read out her personal statement in court.
Wearing a camel-coloured coat, she stands in the witness box and addresses the court.
"On 21 August, the day I not only lost my daughter but my best friend.
"Two police officers stood at my door - an image that will haunt me forever. 'Can we come in? ...She’s passed away', they said."
Family handoutCopyright: Family handout
"Time stood still," Julie says.
"How? Why? What’s happened?"
There were tears from relatives listening to it.
Witham has his head bowed, the other defendants are looking down.
Live Reporting
Edited by Rachael Lazaro
All times stated are UK
Feud over drugs flared up at festival
Ashley was murdered at her home in Leinster Road, Liverpool, caught in the crossfire of a feud between Barry and her boyfriend.
The row began years ago over the theft of drugs, but flared up at Glastonbury last June, where Barry was heard threatening to stab Lee Harrison.
Zeisz was then assaulted by a group, thought to include a friend of Mr Harrison's.
The trial was played voice notes and messages sent by Ashley (seen in this photo at Sefton's Fusion festival with her mum Julie) to her friends in the two months before her death.
Witham admitted manslaughter and claimed he was acting alone - but the prosecution alleged he was the "fall guy", who was trying to protect his co-defendants.
Mr Harrison, who did not co-operate with police following his girlfriend's death, was out on the night of the murder and has since spent time in Dubai, the court heard.
Watch the moment police arrested gunman
The moment gunman James Witham was arrested was captured on camera by officers
He was stopped on 13 September 2022, originally giving the police the false name of Francis Kelly.
Video content
The sentences in full
Here's a recap of the sentences handed out at Liverpool Crown Court.
Niall Barry, 26, of Moscow Drive, Tuebrook, was described as the "malign presence" in the murder of Ashley Dale and given a life sentence with at least 47 years behind bars.
Sean Zeisz, 28, of Longreach Road, Huyton, was also handed a life sentence - with a minimum of 42 years - for his role organising and encouraging the shooting of Ashley at her home in Old Swan, Liverpool, in August last year.
Joseph Peers, 29, of Woodlands Road, Roby, Merseyside, who was described as a "foot soldier", was jailed for life with a minimum term of 41 years.
Gunman James Witham, 41, of Ashbury Road, Huyton, Merseyside, was also given a life sentence with a minimum of 43 years.
Tears from the killers' families
Nick Garnett
The four men have now been taken down to the cells.
Sobs of tears can be heard from the public gallery where relatives of the jailed men have been sitting.
'Ashley's family shown dignity throughout'
Nick Garnett
The judge says to Ashley's family: "I have been struck by the dignity you have shown and your personal statements - they were truly remarkable."
He also commended the work of the senior investigating officer Cath Cummings for her work.
BreakingJoseph Peers, 29, sentenced to 41 years
Joseph Peers, 29, has been sentenced to life with a minimum of 41 years.
Peers was described in court as a "foot soldier" after he drove a Hyundai to the scene and earlier helped James Witham to stab the tyres of Ashley's car, in an attempt to lure her and her partner out of the house.
A jury found him guilty of murder, conspiracy to murder Lee Harrison - Ashley's boyfriend - and conspiracy to possess a prohibited weapon.
BreakingSean Zeisz, 28, jailed for life with a minimum of 42 years
Sean Zeisz, 28, has been jailed for life with a minimum term of 42 years for his part in the murder.
A jury found him guilty of murder, conspiracy to murder and conspiracy to possess a prohibited weapon.
Niall Barry, 26, sentenced to 47 years
Niall Barry, 26, has been sentenced to life with a minimum of 47 years for his part in the murder.
Barry and Sean Zeisz, 28, were found to have helped organise and encourage the killing, which came after a feud with Ashley's boyfriend Lee Harrison.
A jury found him guilty of murder, conspiracy to murder Lee Harrison and conspiracy to possess a prohibited weapon.
BreakingAshley Dale's killer, James Witham, sentenced to 43 years
James Witham, 41, has been sentenced to life with a minimum of 43 years for his part in the murder of Ashley Dale.
Ashley was killed when Witham fired a Skorpion sub-machine gun in her house in Liverpool in the early hours of 21 August 2022.
He previously admitted firing the bullet that killed Ashley but claimed it was accidental.
A jury found him guilty of murder, conspiracy to murder Lee Harrison - Ashley's boyfriend - and conspiracy to possess a prohibited weapon.
BreakingAll four jailed for life
Four men jailed for life for murder of Ashley Dale.
All dangerous offenders - judge
Mr Justice Goose tells the four convicted men: "Each of you is a dangerous offender".
Judge about to start sentencing
The judge has begun his remarks and is about to sentence the four men in the dock.
You can watch the judge's sentencing remarks at Liverpool Crown Court by pressing play at the top of the page.
'I wake hoping this is just a bad dream'
Ashley’s paternal grandmother, Susan Steinhilber - known as "Gramma Sue" to Ashley - has also given a moving tribute to the hearing.
She says: "My talented granddaughter Ashley Louise Dale had the world at her feet and I cannot describe how devastated I feel at losing her, and in such a cruel way.
"I wake every morning hoping that this is just a bad dream, but it isn’t, I miss Ashley terribly, who is no longer with us in body but she will always be with us in spirit."
'Their big sister was no longer here'
More from Ashley Dale's mum, Julie, and the words she read out in court.
She recalls the police leaving her house.
"Ashley's two younger sisters were sleeping peacefully in their beds upstairs, she says.
"Then the reality set in, that I was going to have to tell them, their big sister they so adored was no longer here.
"Those poor innocent girls, exposed to this horrific act.
"How can I tell them some evil person has done this to their defenceless sister who was home alone in her place of safety."
She said it was a sound "no mother should hear, the screams of my baby girls when I told them something awful had happened to their big sister, and she had passed away.
"The inconsolable cries of a seven and 12-year-old, whose lights had also just been switched off."
Ashley's dad: 'History repeating itself'
The court heard an impact statement from Ashley's dad, Steven Dunne, which described how - since the moment he was told about the killing - he was "confined to a living nightmare".
"I remember shouting ‘no’ for a long time at the top of my voice; I couldn’t believe it - history had repeated itself.
"My son, Lewis Dunne, had been shot dead seven years previous at only 16 years of age.
"He was shot at close range in the back with a shotgun in a case of mistaken identity; an innocent victim caught in the middle of a gang feud.
"It had been a long seven years of pulling myself out of some very dark – and at times, lonely – places, trying to put my life back together."
'My beautiful daughter'
Andy Gill
Reporter, BBC North West Tonight
Continuing with her statement, Ashley's mum says: “My beautiful daughter was now a piece of evidence.”
Mum - 'I hope my words haunt you forever'
Nick Garnett
Witham has now returned to the dock and is drinking from a bottle of water but as the second statement is read out he still refuses to lift his eyes and look at the court.
Shortly before he left the dock, Julie Dale looked at the four men, with Peers and Witham still staring at the floor. She called them monsters, adding: "I hope my words haunt you forever."
Witham leaves dock after words of Ashley's mum hit home
Nick Garnett
Wtiham has walked to the back of the dock.
He couldn’t cope with the words of Julie Dale that were directed to him.
He has left the dock, the judge says he expects him to come back shortly.
The other three defendants are still there.
Barry and Zeisz ran organised crime ring
The prosecution has detailed the criminality of Niall Barry and Sean Zeisz who were also involved in drug crime.
Zeisz and Barry ran an organised crime ring that supplies drugs across large parts of the UK - from north Wales to Brighton
Their messages were intercepted on Encrochat, a messaging system which was hacked by police.
The messages showed they were involved in a gang able to supply large amounts of drugs around the country, and that Barry was able to source firearms when needed.
'Time stood still when I lost my best friend'
Nick Garnett
Julie Dale, Ashley's mum, has read out her personal statement in court.
Wearing a camel-coloured coat, she stands in the witness box and addresses the court.
"On 21 August, the day I not only lost my daughter but my best friend.
"Two police officers stood at my door - an image that will haunt me forever. 'Can we come in? ...She’s passed away', they said."
"Time stood still," Julie says.
"How? Why? What’s happened?"
There were tears from relatives listening to it.
Witham has his head bowed, the other defendants are looking down.