Semen found on clothing worn by the victim of a cold case murder in Melbourne matches the DNA of a relative accused of stabbing her to death, a court has been told.
Ranny Yun, 27, was found dead in the sewing room of her Springvale home in October 1987 and Meth Mean was charged in November 2017 with her rape and murder.
Semen found on a tracksuit wrapped around her left ankle allegedly belongs to Mean, a forensic officer told a pre-trial committal hearing at Melbourne Magistrates Court on Tuesday.
His DNA also allegedly matches the semen found on her genitals, according to the officer's statement to police.
An autopsy determined Ms Yun was hit on the back of the head and had her throat cut.
Pathologist Stephen Cordner did not find any defensive injuries, suggesting Ms Yun was incapable of defending herself, possibly because she was impaired.
Professor Cordner believes the blows to the back of Ms Yun's head happened before the injuries to her neck.
Injuries found behind Ms Yun's left ear could mean someone tried to cut her ear off, he said.
"I don't know ... but that sort of thought comes to mind," Prof Cordner said under cross-examination.
Husband Kuy Thong said Ms Yun told him she was about six weeks pregnant before she was murdered.
"I put a baby doll in Ranny's coffin when she died," he said in a statement to police on November 1, 2017.
Ms Yun's younger cousin Rada, who was 13 when she discovered Ms Yun's body, told police in 2010 her cousin was killed "the Asian way".
"I used to live in the Khmer Rouge regime, and this is how people were killed," she told the court, referring to Cambodia's brutal former regime.
"I've seen how people got killed and hit from behind."
The younger cousin, now in her mid 40s, said she came home from high school with another relative on October 15, 1987 and found the front door unlocked.
When she walked into Ms Yun's room, she found her cousin lying on her back on the floor.
The cousin made three statements to police, including one in 2010 that states: "I believe Ranny was murdered by someone she knew."
The younger cousin and Ms Yun used to live with Mean and his family. Ms Yun's husband is Mean's cousin.
Rada on Tuesday said there was tension and "agitations" when she and Ms Yun lived with the Mean family.
"I just remember that there were agitations between Ranny and Meth, but it was just little family problems."
The hearing before magistrate Donna Bakos is due to resume on Wednesday.