BOSTON -- Tears rolled down the face of Neil Entwistle in court on Thursday as he and the jury were shown a graphic video of the scene where his wife and baby daughter were found shot to death in their Hopkinton home. But some in the court questioned his emotional reaction to the tape, saying it appeared the Briton was actually holding back laughter.

Defense: Entwistle Didn't Laugh | Neil Entwistle Cries As Crime Scene Video Played

Neil Entwistle, 29, is accused of shooting his wife, Rachel, 27, and their 9-month-old daughter, Lillian Rose, in January 2006 in their rented Hopkinton home because he faced heavy debt and was unhappy with his sex life.

Two minutes into the 18-minute long tape -- a room-by-room walk-through of the family's 6 Cubs Path home -- Neil Entwistle cupped his hand over his mouth and began to cry. But some court observers said Neil Entwistle's expressions looked more like stifled laughter -- an interpretation that outraged his defense team.

"There is no way that Neil would be laughing. He is grieving. He has lost his wife. He has lost his baby. You have heard what a loving father he was, what a loving husband he is," defense attorney Stephanie Page said.

The video, taken by state police investigators, showed the bodies of Rachel and Lillian Entwistle lying in bed covered in a white comforter. It was silent, except for the faint sounds of classical music playing in the empty nursery.

"It would be natural for you to find this evidence upsetting and disturbing," Middlesex Superior Court Judge Diane Kottmyer told the jury before the video was shown. "You will be required to put aside any feelings of sympathy or any other emotions that you may experience as a result of hearing and seeing this evidence and to be objective in your consideration of the evidence."

Although she could not see the video monitors, his mother, Yvonne Entwistle, also broke down. His father, Clifford, wiped away tears as the couple's younger son, Russell, tried to comfort his mother.

Page said she and defense attorney Elliot Weinstein were so concerned about their client's reaction to the tape that they sat on either side of him -- Weinstein watched the tape as Page watched Neil Entwistle.

On Wednesday, police described finding the young mother and baby dead of gunshot wounds. They said the woman's right arm was draped across her child's chest.

"I lifted the corner of the comforter, and I observed what appeared to be a foot," Hopkinton police Sgt. Michael Sutton said. "We made our way to the opposite corner of the bed. I then lifted the comforter at that corner. I first observed a small baby's face. I was looking down at the top of the head -- the forehead, eyes and nose. I looked to the right of the baby's face and saw a woman's face."

Prosecutors said that Neil Entwistle's DNA was found on a .22-caliber Colt revolver used in the slayings, and his wife's DNA was found in and on the muzzle of the gun. The prosecution said Neil Entwistle stole the gun from the Carver home of his father-in-law, Joseph Matterazzo, and returned it after the shootings.

On Wednesday, Sgt. Mary Ritchie, a crime scene investigator for the state police, said no identifiable fingerprints were found on the revolver.

Defense attorneys have argued that Neil Entwistle was grief-stricken after finding his wife and baby dead and went to England to be consoled by his parents. He was arrested at their home in England a few weeks later.