LOS ANGELES (AFP) - The B-movie actress allegedly murdered by music producer Phil Spector probably committed suicide, a retired forensic expert testified Tuesday as the rock legend's defense case got underway.

Blood spatter and gunshot residue patterns found around Lana Clarkson's body at Spector's home four years ago indicated that the 40-year-old had killed herself, Vincent DiMaio testified.

DiMaio, the former chief medical examiner for Bexar County in Texas, told jurors at Los Angeles Superior Court that there was no forensic evidence that pointed to Clarkson's murder.

"That's the objective evidence," DiMaio said. "There is no objective scientific evidence that anyone else held the gun."

DiMaio was testifying after the prosecution completed their case against Spector, two months after opening statements.

Prosecutors say Spector had a "rich history" of gun-toting drunken rages against women, which they say culminated with Clarkson's murder just hours after he picked her up from a Hollywood nightclub on February 3, 2003.

Spector's defense says Clarkson killed herself, claiming forensic science will prove that the 67-year-old music pioneer did not pull the trigger.

DiMaio said it was likely Clarkson's judgement would have been impaired, citing a blood-alcohol level of 0.12, above the legal driving limit of 0.08.

"You've seen drunk people do stupid things," he told jurors, noting that Clarkson also had the powerful painkiller Vicodin in her system at the time of her death.

Spector, famed for his groundbreaking "Wall of Sound" recording technique, is regarded as one of the most influential figures in rock-pop music history.

In the early 1960s he was responsible for hits including "Da Doo Ron Ron," "Be My Baby, Baby" and "You've Lost That Lovin' Feelin.'"

Famed for his work with The Beatles, Tina Turner, The Righteous Brothers, The Ronettes and The Ramones, he faces 15 years to life in prison if convicted of second-degree murder.

Clarkson starred in 1987's "Amazon Women on the Moon" and 1991's "The Haunting of Morella," but her career had stalled at the time of her death.