Following the death of Mr O'Halloran, who was riding a mobility scooter, detectives have released images of a man they want to identify as soon as possible.
He was seen fleeing the scene armed with a knife," according to the Metropolitan Police.
"He is clearly a dangerous individual," said Detective Chief Inspector Jim eastwood/">Eastwood, who is leading the investigation. "People are advised not to approach him, but to call us immediately on 999 if they know him or have any information regarding his whereabouts."
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