SAN DIEGO (CNS) - Jeff Boswell was sentenced to life in prison on Friday without the possibility of parole. The 45-year-old was found guilty of first degree murder for beating and strangling 87-year-old Blanche Griffin in 2013.

Besides first-degree murder and special circumstance allegations of murder during a burglary and murder during a robbery, Boswell was convicted of two separate burglaries at a liquor store and a market.

In her opening statement at trial, Deputy District Attorney Lucy Yturralde said Boswell had moved into his girlfriend's duplex behind Griffin's home on F Street near 29th Street.

A landscaper saw the victim outside her home looking "nervous and afraid" the morning of July 9, 2013, the prosecutor said.

Boswell's girlfriend told police that she noticed he was not in bed after midnight and returned about 7 a.m. looking "disheveled."

When Griffin's daughter couldn't reach her mother, her husband went to check on his mother-in-law about 2:45 p.m. and saw her body through a window.

A deputy medical examiner determined Griffin had suffered blunt force trauma to her head, neck and chest, and was strangled, according to Yturralde.

The victim's wedding ring and other jewelry she always wore were missing and her computer was gone, the prosecutor said.

The next morning, when police went to interview Boswell, he was hiding in the bathroom of his girlfriend's duplex, Yturralde told the jury.

Boswell was arrested but subsequently released from custody, during which time he burglarized a liquor store and a market within an eight-day period in July 2013 because he needed money to support his drug habit, the prosecutor said.

Yturralde said Boswell's DNA was found under Griffin's fingernails and on her neck. He was then re-arrested on a murder charge.

Boswell testified that he helped the victim get around and had no reason to kill her. He said Griffin would occasionally give him money, so he had no motive to rob her.