A British man has been remanded in custody on charges of killing his American wife and baby daughter in what detectives say may have been a failed murder-suicide bid.
Neil Entwistle, who was arrested in London earlier, is accused of shooting his wife Rachel in the head before turning the .22-calibre handgun on nine-month-old Lillian in a bed at their home in Hopkinton, Massachusetts, three weeks ago.
The unemployed computer programmer, who left the US a day after the killings to stay with his parents in Worksop, Notts, appeared at Bow Street Magistrates Court for the start of the process to extradite him to America.
Entwistle confirmed that he would not consent to be extradited to the US "at this stage" when he appeared before magistrates. The extradition proceedings were adjourned until Friday when Entwistle will again appear before the court.
Middlesex District Attorney Martha Coakley earlier told journalists in the US he had been having financial problems before the murders and had no apparent income to support his family. She said a reporter's suggestion at the press conference in Cambridge, Massachusetts, that Entwistle was a "desperate man" was "not an unfair conclusion".
He has been linked in reports to a website offering what appeared to be get-rich-quick pyramid schemes. As well as two counts of murder, the 27-year-old also faces accusations of illegal possession of a firearm and illegal possession of ammunition.
Ms Coakley said investigators believed he had killed Mrs Entwistle and Lillian with a gun he had taken from his father-in-law's collection, and later returned secretly. Forensic evidence linked it to both Entwistle and his wife but she had never used it, she said.
Detectives believe the mother and baby were murdered on the morning of Friday January 20, and that Entwistle took a BA flight to London from Boston's Logan International Airport at 8.15am on the Saturday. He had managed to buy a ticket on the phone at 5am using a credit card.
The bodies were discovered by police on Sunday evening hidden from view by piles of fluffy blankets and duvets. Officers had already looked in the room and spotted nothing the night before, after fears were raised by friends who had turned up for a dinner party and found the house apparently empty.
Ms Coakley said Entwistle had left debts in England when he moved to the US last year, his internet businesses were failing and he had new financial obligations, including the lease on his five-bedroom home. The debts were not a "huge amount" but he was jobless and had no visible means of support, she said.