Ava White: Sister Mia speaks about losing her sibling
Ava White's sister has spoken for the first time about her murder.
Mia White described the moment she found out her 12-year-old had been fatally stabbed by a teenage boy.
It later emerged Ava had been killed in a row over a Snapchat video.
Mia now hopes to launch a campaign to discourage youngsters from carrying knives.
Reporter: Rachel Stonehouse
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