The man accused of murdering Bradford prostitute Maureen Stepan had bloodstains on his jeans, a Court was told.
Sheffield Crown Court heard that George Naylor's jeans had patches of blood both on the right and left knee.
He denies murdering the 18-year-old at her home in Washington Street, Girlington, on June 8, 1995.
The jury was told how Naylor had washed the jeans at a friend's house on the day Maureen was found dead.
Forensic scientist Pauline Simons said that tests had revealed it was female blood.
"DNA tests showed that only one person in 14,000 was likely to have this DNA profile as the blood found on one leg of the jeans," she said.
"The jeans appeared to have recently been washed.
"On the right knee there were two small areas of washed-out bloodstains. No further tests were done on these.
"On the left knee there was an area of washed-out bloodstains which had soaked through the thickness of the fabric."
Mrs Simons described how two bloodstains had been found on the carpet next to Maureen's body which matched her blood group.
"There was a possibility that the blood originated from the mouth, as traces of saliva were found in it," she said.
Fibres from the red sweatshirt that Naylor was wearing on the day Maureen died were found on her body and on the tights she was strangled with.
A fibre from his shirt was found on Maureen's settee and fibres from his car were said to have been discovered on Maureen's coat.
But Mrs Simons added that this evidence was of limited significance as only a few fibres had been found.
The trial continues.
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