A youth who fatally stabbed a man with a screwdriver near a children's play area in Birmingham has been urged to hand himself in to police.
Releasing an e-fit of the teenager, detectives said the male, who is thought to be aged about 17, ran off after stabbing Sarfraz Khan during an argument in Sparkbrook, last Friday.
Mr Khan, 24, from the Hodge Hill area of the city, died in hospital on Tuesday after suffering a severe head injury during a dispute with a group of up to eight teenagers.
It is believed that Mr Khan, a shopkeeper's son, became involved in an argument with the group after they objected to him urinating at the Larches Green play area.
Appealing for those involved in the argument to come forward, Detective Chief Inspector Richard Baker said: "There appears to have been an exchange between Sarfraz and some of the girls in the group, which turned into an argument and two male youths from the group joined in.
"At some point, a screwdriver was produced by one of the males and Safraz was stabbed in the temple."
Speaking to reporters at West Midlands Police headquarters, Mr Baker said early inquiries suggested the wanted youth was of Asian appearance or of mixed race.
Detectives have confirmed that the eight-inch screwdriver used in the attack had been recovered.
Making a direct appeal to the youth, the officer said: "This is now a murder inquiry, so he needs to come forward - it is in his best interests to do so.
"From what we know from statements that we have got from friends of Sarfraz, it would appear that this was entirely spontaneous. It's an argument that escalated.
"We don't think there was any historical connection between Sarfraz and any of these individuals - they have started abusing him because he was urinating in a public park."
Anyone with information about the stabbing, which took place between 10.30pm and 11.30pm, should contact West Midlands Police on 0845 113 5000.