BOSTON -- Sinking in debt and dissatisfied with his sex life, Neil Entwistle killed his wife and baby daughter in the British man's Hopkinton home, a Middlesex County Superior Court jury found on Wednesday.

Unedited Video: Entwistle Verdict

Entwistle, 29, was found guilty of two counts of murder in the first-degree in the shooting deaths of his wife, Rachel, 27, and their 9-month-old daughter, Lillian Rose, as they lay snuggled in bed in January 2006. He then fled to England.

"We may never know why this happened, but we do know that Rachel and Lillian Rose loved and trusted Neil Entwistle," said attorney Joseph Flaherty, a spokesman for Rachel's family. "Neil Entwistle's actions on Jan. 20, 2006 betrayed that love and trust. Neil Entwistle will now live with his evil deeds for the rest of his natural life, only to be judged again. Rachel and Lillian Rose left us too soon in life, but they will rest in peace together for ever in each other's arms and we will see them again someday."

Entwistle closed his eyes and shook his head as the verdicts were read but showed no emotion. He was also found guilty of illegal possession of a firearm and illegal possession of ammunition.

Entwistle's mother, Yvonne Entwistle, addressed a crowd outside the courthouse, saying that her son was innocent and that she believed Rachel had been suffering from depression.

"We know that our son Neil is innocent, and we are devastated to learn that the evidence points to Rachel murdering our grandchild and then committing suicide. I knew that Rachel was depressed. Our son will now go to jail for loving, honoring and protecting her memory," Yvonne Entwistle said.

Entwistle is scheduled to be sentenced at 10 a.m. Thursday. The sentence for first-degree murder in Massachusetts is automatically life in prison without the possibility of parole.

"This has been a very, very sad case for two families -- one in the United Kingdom and one in the United States. We did everything that we knew how to do to provide Neil Entwistle with a vigorous defense," defense attorney Elliot Weinstein said.

Weinstein said that defense attorneys would appeal the case on the basis that Entwistle was denied a change of venue and police officers twice entered his client's home without a warrant.

"We know that there are very significant issues of constitutional law that will be presented upon appeal," Weinstein said.

Middlesex District Attorney Gerry Leone indicated that he was not surprised at the way Entwistle's parents reacted to the verdict.

"I'd expect nothing less of the parents of someone who has been convicted of first-degree murder," Leone said. "The jury has spoken in this case -- they have spoken loudly. Frankly, our thoughts are with them, as well, because Neil Entwistle is the one whose reprehensible, shameful, cowardly acts were the basis for this first-degree murder. I wouldn't comment on anybody else who has been collateral damage in the wake of what he did."

While the defense tried to describe Entwistle as a devoted family man, the prosecution painted a picture of a man with a dark side who visited Web sites about killing and suicide and e-mailed women to arrange "discreet" relationships.

Entwistle, a computer engineer, didn't have a job and faced mounting debt, including a monthly rental payment of $2,700 for the Hopkinton home, which the family had moved into just 10 days before the slayings, the prosecution said.

"This April, Lillian would have been 3 years old. She should be here walking, talking and playing with her mom. That is not going to happen because of the reprehensible acts of Neil Entwistle," Leone said after the verdict.

The day after the shootings, Entwistle bought a one-way ticket and boarded a British Airlines flight out of Logan International Airport to his native England, where he was arrested two weeks later.

A jury of six men and six women weighed testimony from family members, friends and investigators for about 11 hours before coming back with the guilty verdicts. The jury rejected the defense team's claim that Rachel killed her daughter before turning the gun on herself.

"I suggest that she might not even have known how to load (the gun) and handle it -- but he did," Assistant Middlesex District Attorney Michael Fabbri said, pointing at Entwistle.

Entwistle claimed he found his family dead in the master bedroom of the 6 Cubs Path home after running errands on Jan. 20, 2006. To protect Rachel's memory, Entwistle returned the gun, a .22-caliber revolver owned by Rachel's stepfather, to his in-laws' Carver home, the defense said. He then flew home to England, without calling the police or Rachel's family.

In closing arguments, the prosecution said the murder-suicide theory didn't "make common sense."

"She was happy. She had no reason to commit suicide," Fabbri said.

Entwistle did not take the stand and the defense rested without calling a single witness.