Lana Clarkson, 40, was found shot dead at Spector's home in February 2003.
The actress, whose film roles included titles such as Amazon Women on the Moon and Barbarian Queen, suffered a fatal gunshot wound to her face.
However in the latest turn of event in the high-profile case Dorothy Melvin, a former partner of the producer, told the courtroom of a violent incident which occurred when she tried to leave his house one night as the prosecution team attempt to prove that Spector has a history of violence against women.
"He started screaming at me to get back in the house, he was pointing the gun at me," Ms Melvin told the jury.
"He hit me on the side of the head with the gun. I was terrified."
Spector, who was once hailed in the music world for the adoption of his 'Wall of Sound' recording technique, denies murdering Clarkson. Defence lawyers for the music producer are set to tell jurors that the actress killed herself.
According to reports, John Lennon's widow Yoko Ono could be among those appearing as a witness at the trial, which is being hailed as the biggest celebrity legal case since singer Michael Jackson was acquitted on child abuse charges by a court in 2005.
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