A 44-year-old man has been arrested on suspicion of the murder of 87-year-old Thomas O’Halloran on a mobility scooter in west London.
He was arrested at an address in Southall, west London, in the early hours of Thursday, the Metropolitan Police said.
Detective Chief Inspector Jim Eastwood, who leads the investigation, said: “I would like to thank the public for their overwhelming support following this horrific incident. As a result of the release of a CCTV image yesterday, an arrest has been made and this investigation is progressing at pace.
“Mr O’Halloran’s family have been updated with this development and continue to be supported by specially trained officers.”
Mr O’Halloran was originally from Ennistymon in Co Clare.
Detectives said he was stabbed on Western Avenue in Greenford on Tuesday and managed to travel 75 metres on his scooter before asking a member of the public for help in nearby Runnymede Gardens.
Police released an image of a man seen running away from the scene armed with a knife, who they said they were “keen to identify as a matter urgency”. He was wearing grey shorts, a dark-coloured T-shirt, a white baseball cap and white patterned builder-style gloves.