A man has been arrested on suspicion of murder after a 16-year-old boy died following a stabbing incident.
Kyle Sheehan was stabbed in the leg during an incident on Jiggins Lane in Bartley Green, Birmingham, at around 10.15pm on September 21.
He was taken to hospital and treated in intensive care but despite the best efforts of medical staff the teenager died on Friday night, West Midlands Police said.
The force confirmed they had now launched a murder investigation following his death.
A 23-year-old local man has been arrested on suspicion of murder and remains in police custody.
Three other men, aged 16, 18 and 29, were arrested on suspicion of wounding. They have been released on police bail, a force spokesperson said.
Detective Chief Inspector Wayne Jones, from the Force Criminal Investigation Department, who leading the murder inquiry said: "It is tragic that a lad so young has lost his life in such a violent and distressing way.
"He leaves behind a family and many friends who are distraught and struggling to come to terms with what has happened.
"We know many people were in the area and would have seen what went on that night, but many are still yet to come forward to share their information with police.
"We now directly appeal to you to speak to us and help us find those people responsible for killing Kyle."