CCTV images of a young father minutes before he was shot dead in east London have been released.
Peter Woodhams, 22, was filmed running into an alleyway where he confronted two or three teenage gang members that terrorised his family.
The row was also captured on camera, but police would not release that footage for "operational reasons".
Mr Woodhams' family had criticised police handling of an earlier attack on his life by what they believe was the same gang.
The UK's police watchdog, the Independent Police Complaints Commission (IPCC), will now decide whether officers had done their job at the time.
On Monday - the night of Mr Woodhams' death - the television satellite engineer parked his black Ford Focus next to the Nisa supermarket in Freemasons Road, Canning Town.
Moments after disappearing down the alleyway, he dashed back to his car and drove home - all on CCTV.
There he complained to his fiancee, Jane Bowden, 23, about "trouble outside" and ran back out, only to be shot in nearby Leslie Road.
Mr Woodhams staggered home and collapsed in front of her and their three-year-old son Sam.
It is hoped the CCTV images will jog memories and urge witnesses to contact police.
No statement taken
Miss Bowden earlier told of how their family had been terrorised by a gang of youths since January, when some of the teenagers stabbed Mr Woodhams in the neck. The blade narrowly missed his jugular vein.
"They (the gang) were always taunting us," she said. "They knew they had stabbed Peter and got away with it. They thought they were untouchable."
She said she phoned police every day for five weeks after that attack, but no-one bothered to take a statement from her.
Several people anonymously gave names and addresses to police of youths heard boasting about the stabbing, Miss Bowden added. No arrests were made.
The Met has referred the claims to the IPCC, which has started an investigation into the police response to the stabbing.
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