A prosecutor used Neil Entwistle's own words Friday to depict him as a cold-blooded killer who shot his wife and baby daughter to death as they lay in bed together, then fled to England.

In his opening statement, Assistant District Attorney Michael Fabbri quoted comments Entwistle made to police after the bodies of his 27-year-old wife, Rachel, and 9-month-old daughter, Lillian Rose, were found in their Hopkinton home on Jan. 22, 2006.

Entwistle told police he discovered his wife and daughter dead two days earlier after doing errands. He said he covered the bodies and left for his native England — all without ever calling for police or telling his wife's parents, people Entwistle told authorities were as close to him as his own mother and father, Fabbri said.

"I didn't even call 911 or call for help," Fabbri quoted Entwistle as telling the police.

In his opening statement, defense attorney Elliot Weinstein said his client's actions after the killings were those of a grief-stricken husband and father. He told the jury repeatedly that Entwistle loved his wife and daughter.

"Everything he said and everything he did thereafter, he did because he loved them, he did because he loved them both," Weinstein said.

Opening statements began Friday morning after attorneys spent four days seating a jury of eight men and eight women, including four alternates. Entwistle has pleaded not guilty.

Entwistle's mother, father and brother were in the courtroom Friday, as well as Rachel Entwistle's stepfather and about a dozen other friends and relatives.

Fabbri said that by outward appearances, the Entwistles seemed "nothing but loving and stable," but there was another side to Neil Entwistle.

In the months before the killings, Entwistle visited Web sites to look for sex and e-mailed women to discuss setting up discreet relationships, Fabbri said. He also visited sites about killing and suicide in the days before his wife and daughter's deaths.

Weinstein told the jury both Rachel and Neil Entwistle were computer savvy, and said he would present evidence that other people used the computer as well.

Fabbri also said the jury would see evidence that showed Entwistle's DNA was found on an ammunition container, a gun lock and the grip of the handgun used to kill Entwistle's wife and daughter. He said Rachel Entwistle's DNA was found in and on the muzzle of the gun.

Entwistle and Rachel Souza met in 1999 at Britain's University of York, where she was spending a year abroad. They married in 2003 and lived in England for two years before moving to Carver, Mass., a small town about 40 miles south of Boston, in the summer of 2005 to live with her mother and stepfather.

They began renting a $2,700-per-month house in Hopkinton 10 days before Rachel and Lillian Rose were killed.