A 16-year-old schoolgirl has died after being stabbed in the head with an afro-comb.

Julie Sheriff was injured during an argument at a bus stop four months ago in Battersea where she was stabbed in the head. She spent four months in a coma and was showing signs of recovery but unfortunately died on Wednesday.

The Hackney schoolgirl came to England with her father in 2006 from Sierra Leone in search of a better life. But her father believes she was being bullied and said Julie had fallen out with a group of friends in a row over a £5 note and a bus pass in the months before she was attacked in May – and blames them for her death. He said

The girls had been at the flat two days before and my daughter’s £5 note had gone missing, while one of them said they had lost a bus pass. It escalated and I asked them to leave. Then they turned up throwing stones and threatening my daughter. I called the police and they spoke to my daughter who was crying in her bedroom. The girls had told her they would attack her at school, but the police refused to do anything as there was no CCTV on the estate.

Mr Sheriff believes that if police had investigated the case properly his daughter would still be alive.

A 15-year-old girl, who cannot be named, appeared in court at Kingston, South West London, earlier this week charged with assault and grievous bodily harm.

Anyone with information is urged to call police on 0208 721 4005, or Crimestoppers anonymously on 0800 555 111.