Detectives are trying to track down three men who may hold vital information on a murder in Greenford.
Dean Mayley, 24, from Northolt, was stabbed in Ruislip Road, Greenford, on February 7 and died later that evening at St Mary’s Hospital.
Mr Mayley, who suffered from microcephaly which led to him having learning difficulties and a mental age of nine, was attacked at about 5.20pm after getting off an E9 bus about 50 minutes earlier in The Broadway.
Police have now released CCTV still images of three men they need to speak to and are keen to stress these individuals are not suspects.
They are being urged to come forward and any information they provide will be treated in the strictest confidence.
The first two images are of people who were present at the KFC in Greenford Broadway before the stabbing.
The third image is of a white man who walked past Mr Mayley seconds before the murder.
Detective Chief Inspector Matt Bonner, of the Homicide and Major Crime Command, who is leading the investigation, said: “I am urging those in the images we have issued to please come forward and help us with our enquiries. Likewise there may be people who recognise these three men; don’t remain silent please come forward and help us.
“I must stress that we are not treating these men as suspects and strongly believe that any information they hold can assist us with our ongoing enquires into Dean’s murder.”
Anyone with any information can contact the incident room on 020 8358 0200 or call Crimestoppers anonymously on 0800 555 111.
Three 17-year-old boys have been accused of the murder of Dean Mayley and a 19-year-old man has been charged with the murder.
Their trial date has been set for August 4.