Police have released footage of a teenager being chased by three men moments before he was stabbed to death in Norwich.

Joe Dix, 18, was attacked outside his flat in Vale Green, Norwich, after he had gone to help a friend in a nearby crack house which being robbed by Hans Beeharry, 20, Benjamin Gil, 19, and Cameron Palmer, also 19.

Eastern Daily Press: Joe DixJoe Dix (Image: Supplied by family of Joe Dix)The trio, from Norwich - who have been convicted of murder - confronted Mr Dix before chasing him through the streets and attacking him.

He died in hospital after the stabbing on January 28 last year.

Eastern Daily Press: Police in Vale Green after Joe Dix was fatally stabbedPolice in Vale Green after Joe Dix was fatally stabbed (Image: Peter Walsh, Newsquest)CCTV cameras in the area picked up Mr Dix being pursued by his killers.

Eastern Daily Press: Cameron Palmer, Hans Beeharry and Benjamin GilCameron Palmer, Hans Beeharry and Benjamin Gil (Image: Norfolk Constabulary)

Norfolk police released footage of some of the chase after the sentencing of Beeharry, Gil and Palmer earlier this week.

Eastern Daily Press: The defendants returning to Benjamin Gil's flat after the stabbing of Joe DixThe defendants returning to Benjamin Gil's flat after the stabbing of Joe Dix (Image: Norfolk Constabulary)

Both Gil and Palmer were holding weapons during the chase.

Eastern Daily Press: Benjamin Gil and Cameron Palmer picked up in the pursuit of Joe DixBenjamin Gil and Cameron Palmer picked up in the pursuit of Joe Dix (Image: Norfolk Constabulary)

At 6.55pm Mr Dix could be seen on the footage walking back walking towards his home before collapsing.

Eastern Daily Press: Joe Dix picked up on CCTV before he collapsedJoe Dix picked up on CCTV before he collapsed (Image: Norfolk Constabulary)

At Wednesday's sentencing Beeharry was given life with a minimum of 20 years, Palmer life with a minimum of 21 years and Gil to life with a minimum of 21 years by Judge Alice Robinson.