Police are offering a £10,000 reward to anyone that can give information that will lead to the arrest of escaped murderer Lerone Boye.
Boye, who was sentenced last year to life with a minimum 28 years for murdering 17-year-old Kevin Chibueze, escaped from the John Howard Centre mental hospital in east London on 16 October and has not been seen since.
In a bid to find the whereabouts of Boye, Scotland Yard have issued a new image of the convicted murderer. Police warn the public not to approach Boye, but to call 999.
He is described as a black man who is 5ft 10ins tall and of slim build. He has a distinctive horseshoe shape scar on his right cheek and a gold tooth in his upper row of teeth. He also has short hair and a goatee beard.
Police say although it is possible that he has changed his clothing, Boye was last seen was wearing a grey/blue sweatshirt with a grey vest over the top. He was also wearing grey jogging bottoms.
Police say there is some intelligence which would suggest Boye may be in the east London area, but he is also known to have links to Barking, Newham and Ilford.
Boye's 17-year-old victim was fatally stabbed at the Arteflex Club in Ilford High Road, east London, on 15 August 2011.
He was chased out of a birthday party and attacked with glass and broken bottles.
Boye's three co-accused are also serving life sentences.
Anyone with any information about Boye's whereabouts can also call police on 020 8358 0100 or Crimestoppers anonymously on 0800 555 111.
In October, Dean Ablakwa, who works at the John Howard Centre, was accused of helping Boye escape from the mental health unit. He was charged with one offence of conspiracy to assist an offender escape from lawful custody.