CCTV images of the last moments of a young father murdered in east London have been released by detectives.
Peter Woodhams, 22, was shot dead shortly after confronting youths at shops in Canning Town, on Monday.
CCTV shows him arriving at the shops, but pictures of the row have not been released for "operational reasons".
There has been criticism of police handling of an earlier attack on Mr Woodhams, which is now the subject of an independent investigation.
It is hoped releasing footage of Mr Woodhams' movements in the hour before his death will prompt more witnesses to come forward.
He had driven to the shops in Freemasons Road and is thought to have got involved in a row with two or three youths.
A Scotland Yard spoksman said: "Officers have footage of the suspects and the altercation but for operational reasons do not wish to release it at this stage."
The CCTV pictures released show him arriving, disappearing down an alleyway, then running back to his car and driving off.
Mr Woodhams had just returned from the local shops
When he got home he complained of "trouble outside" and went out on foot, but was shot in nearby Leslie Road.
He staggered home and collapsed in front of his fiancee, dying shortly afterwards.
It has emerged that Mr Woodhams had been stabbed in the neck and slashed in the face with a knife in January, again after confronting youths in Freemasons Road.
His family have accused the police of a series of failings in the investigation of that attack, for which no-one was charged.
The Independent Police Complaints Commission has promised a "robust investigation" into police handling of the stabbing. Met Commissioner Sir Ian Blair has also been asked to report in full to the Metropolitan Police Authority on how his officers handled the inquiry.
Scotland Yard has apologised for any hurt caused to the family during the first police inquiry.
Newham borough commander Michael Johnson has denied that there was a problem with violent gangs in the area, but said a dispersal order and six anti-social behaviour orders had been issued to troublemakers this year.