A man has been arrested on suspicion of murder after a 36-year-old was shot dead in front of his wife and child.
Flamur Beqiri, a Swedish national, died yards from his home in Battersea Church Road, south-west London, on Christmas Eve.
Police said the shooting could have been a “targeted attack”.
The 22-year-old suspect was held under a European Arrest Warrant at Copenhagen Airport on Monday pending extradition back to the UK, the Met said.
Det Insp Jamie Stevenson said Mr Beqiri was shot multiple times by a lone attacker who fled on foot.
Mr Beqiri was of Albanian heritage and had been living in London for four or five years.
The Met previously said it believed he may have been involved in some criminality in Sweden.
In a statement released through Scotland Yard shortly after his death, Mr Beqiri’s family said: “Our family are in a state of shock and are grieving. To have so much sadness at this time of the year is heartbreaking.”
According to reports, Mr Beqiri is the brother of former Real Housewives Of Cheshire star Misse Beqiri.