The Metropolitan Police said officers were called to a report of a robbery on Goodchild Road, Manor House, just before 6pm on Tuesday.
The London Ambulance Service attended the scene and an 87-year-old man was taken to hospital, where he died on 8 May.
A 59-year-old man has been arrested on suspicion of murder and robbery. He remains in custody.
He was also arrested on suspicion of a racially aggravated public order offence and assault on police and taken into custody, the Metropolitan Police said.
Detective Chief Inspector Mark Rogers, from the Met’s Specialist Crime North Unit and leading the investigation, said: “This is a horrific incident which very sadly resulted in an innocent man dying. His family are being supported by specialist officers.
“At this stage we are not looking for anyone else in connection with the incident. However, this is a fast-paced investigation and I am appealing to anyone who may have been in the area or witnessed what happened to please contact the police.”
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