Police have released CCTV stills of two young men they wish to speak to in connection with the “unprovoked” killing of a shop worker in Mill Hill.

Vijay Patel, 49, from Colindale, died in hospital on January 8 after being found injured in The Broadway at 11.45pm two days earlier. A 16-year-old boy from Brent, who cannot be named for legal reasons, was arrested on January 7 and charged with Mr Patel’s murder the following day.

The two people police wish to trace have been described as black teenagers, with one of them wearing a red sweatshirt, black jeans and white trainers.

The other was wearing a dark coloured hooded sweatshirt or jacket and dark coloured jeans – and carrying a Nike rucksack.

Det Insp Ian Lott of the Met’s murder squad said: “We are releasing CCTV images of two male youths who were in the shop during the initial dispute and were outside at the time Vijay Patel was assaulted.

“This was an unprovoked and wholly unnecessary attack on a man who was just trying to do his job. It is vitally important that these two males are traced as they undoubtedly have information that could assist our investigation.

“While one male has been charged with Vijay’s murder, I still need the public’s help to ensure all those who were involved in this incident are identified and held to account for their actions.”

A post mortem is scheduled to take place at Northwick Park Hospital mortuary tomorrow.