Detectives are appealing for help in tracing a man in connection with the murder of Dilip Unadkat, found stabbed to death in his Wembley flat.
Mr Unadkat, 48, of Alexandra Court, in Empire Way, was discovered on November 27, after police broke into his home.
Officers had received a phone call from a concerned family member who had not heard from him for some time.
Police are now handing out posters and leaflets around the Edgware Road in a bid to trace Ahmed Mahmoud El-Shubrawy who they wish to speak to in connection with the investigation.
The 26-year-old Egyptian national is known to frequent areas of west London and Birmingham.
He is 5ft 6ins tall, with black hair and brown eyes. He has a tanned completion and speaks with a Middle Eastern accent.
Detective Inspector Lee Presland, who is heading the investigation, said: "We are now extending our appeal for information regarding El-Shubrawy's whereabouts to the north African/Middle-Eastern communities in West London.
"El-Shubrawy would often socialise in cafes along the Edgware Road. He may be using an alias of Ahmed Mahmoud Abu-Hajaj, and may describe himself as Iraqi."
Anyone with information is urged to contact police on 020 8358 0200 or call Crimestoppers anonymously on 0800 555 111."
A man has been charged in connection with this inquiry.