Emma Caldwell was 'agitated' when mother last saw her alive

Margaret Caldwell said Emma started taking heroin after the death of her older sister in May 1998

The mother of Emma Caldwell said her daughter had been "agitated" when she last saw her alive, her murder trial has heard.

Margaret Caldwell said Emma had asked to be dropped off at a Glasgow women's hostel, where she was living in 2005.

The 27-year-old sex worker was reported missing later that week after she failed to respond to phone calls.

Iain Packer has denied strangling Emma and leaving her body in woods, and 46 charges against 27 other women.

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Margaret Caldwell told the High Court in Glasgow that she had waved her youngest child goodbye on Sunday 3 April 2005.

Emma called back: "Bye, Mum - phone you Monday or Tuesday."

She is said to have been murdered two days later.

After Emma was reported missing, Mrs Caldwell and her late husband, William, searched for weeks trying to find her.

Mrs Caldwell, 76, said: "We went out every morning around the area and Glasgow city centre itself.

"We spent hours and hours every day looking for her.

"Sometimes you thought you saw her in the distance, but it was someone else.

"We did not know what else to do."

Emma Caldwell's body was found in a remote part of South Lanarkshire five weeks after she went missing

Emma's body was found by a dog walker in Limefield Woods in Biggar, South Lanarkshire, on 8 May 2005.

Iain Packer, 51, is alleged to have murdered her there.

Mrs Caldwell told the court she had three children - Karen, Jamie and Emma.

The witness said they had a "happy home" living together as a family in the village of Cardross in Argyll.

The court heard Karen died in May 1998, at the age of 31, when Emma was around 20 years old.

Jurors were shown a smiling photo of the two siblings but Mrs Caldwell said her eldest daughter was "very ill" when it was taken.

Prosecutor Richard Goddard KC asked her how Karen's death affected Emma.

She replied: "It affected her badly.

"I think at the time I was so deep in grief that she needed my help, but I was very selfish and I know my family suffered because of that - both my son and Emma."

The court heard that Emma entered into a relationship with an unnamed man who introduced her to drugs

Mrs Caldwell believes she began using heroin to help her cope with the loss of Karen.

Iain Packer is on trial at the High Court in Glasgow

The court heard that Emma moved to Govan in Glasgow to stay with the man and went on to stay at the Inglefield Hostel.

Mrs Caldwell said she and her husband had a "weekly routine" of meeting up with her and kept in regular contact.

This was to help her with washing clothes, top up her mobile phone and give her food.

Mrs Caldwell said that despite her daughter's drug addiction they did not talk about it a "great deal" with her.

She told the jurors: "We were just happy to be with her."

Mrs Caldwell said she was "overjoyed" when Emma spoke about going into rehab.

Asked if she was aware how Emma funded her habit, Mrs Caldwell said: "We did not realise - we were naive. We did not know how much these things cost."

'Face down and naked'

The trial also heard from dog walker Neil Borland, who discovered Emma's body in Limefield Woods.

Mr Borland was out with his black Labrador, Gigha, who roamed off into trees.

He said: "I could see my dog and she could see me, but she would not move."

The witness then saw Emma's body "lying in puddles between two lines of trees".

The court heard she was face down and naked. Mr Borland also recalled seeing a "garrotte" round her neck.

Iain Packer denies strangling Ms Caldwell in Limefield Woods in April 2005 and concealing her body.

He faces a total of 46 charge against multiple women, three men and a teenage boy, between 1990 and 2016.

The murder charge alleges he assaulted Ms Caldwell by restraining her, grabbing her wrists and strangling her with his hands and a cable.

He is then said to have dumped her naked body in the woods as well as disposing of her clothes, phone and other personal belongings.

He is also alleged to have cleaned a car to "avoid detection, arrest and prosecution".

The trial, before judge Lord Beckett, continues.