Neil Entwistle, 27, who returned to his native England a day after the killings, is charged with two counts of murder and two weapons-related charges, Middlesex District Attorney Martha Coakley said. He was remanded in custody following an extradition hearing at a London court, and will be held until a hearing Friday.
In the early hours of Jan. 20, investigators believe Entwistle used a handgun taken from his father-in-law to shoot his wife and baby while they slept, Coakley said. He shot his wife in the head, and his daughter in the stomach, authorities believe. There was no sign of struggle.
The next morning, Entwistle bought a one-way ticket and hopped on a flight to London. But before leaving, he returned the .22-caliber handgun to his father-in-law's home in Carver, Coakley said. He may have intended to kill himself as well, but didn't follow through.
"We have forensic information that links it both to him and to Rachel, and we know Rachel had not used that gun," Coakley said.
Suggesting a possible motive, Entwistle faced financial difficulties and debt in England as his Internet business ventures failed. At the time of the killings, Neil Entwistle was nearing financial ruin, but he apparently hid the problems from his wife and family, Coakley said.
"The picture we had was of a young couple starting out with a healthy future," Coakley said. But in reality, she said, "he had no money and really had no assets."