A couple have been accused of murdering a man who died after he was assaulted in a supermarket in southwest London, police said on Friday.

Kevin Tripp, 57, died in hospital late on Wednesday night after suffering a head injury during an incident at the Sainsbury's store in Colliers Wood, Merton on Tuesday evening.

Media reports said Tripp had been attacked in a case of mistaken identity after a row about queue-jumping.

"I never thought this could happen. I still cannot believe he has gone," Tripp's partner Josephine James said in a statement.

"Kev was a lovely man, a great dad, a wonderful brother and he will be so, so missed especially by me, his daughter, brother, sisters, nieces, nephews and by all who knew him."

On Thursday, Tony Virasami, 37, appeared at Wimbledon magistrates court charged with his murder. He was remanded in custody until September 18.

His partner, Antoinette Richardson, 37, has also been charged with murder and was due to appear before Sutton magistrates on Friday.

A 19-year-old man who was arrested on Tuesday for threatening behaviour has been released on police bail pending further inquiries.