SAN DIEGO -- Stephanie Crowe's blood was found on a dark red turtleneck sweatshirt that Richard Tuite was wearing the night the 12-year-old was killed more than six years ago, a former DNA analyst testified Monday.

Tia Fenton, (picture, left), testified in Tuite's murder trial that she tested a number of "presumptive blood stains" from the sweatshirt and compared them to known blood samples from the victim, the defendant, Stephanie's older brother Michael and his friends Joshua Treadway and Aaron Houser.

The DNA profile in one stain -- which matched a blood swatch from the victim -- is found in one out of every one trillion Caucasians, Fenton testified.

In a stain that contained DNA from more than one person, the victim could not be excluded as the primary source and Tuite could not be excluded as the secondary source, Fenton testified.

The victim's parents, Cheryl and Stephen Crowe, are expected to testify Tuesday. And on Wednesday, jurors will hear about Tuite's Feb. 2 "walk-away" from the downtown courthouse as jury selection was getting under way.

Tuite, 34, was charged two years ago with Stephanie's murder.

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Michael Crowe, Treadway and Houser were originally charged with the Jan. 20, 1998, killing after Escondido police determined there had been no forced entry into the Crowe family home. But prosecutors have told the jury the confessions were coerced.

Charges against the three boys were dismissed in 1999 when Stephanie's blood was found on the red sweatshirt Tuite had on the night of the killing. The victim's blood also was found on a white T-shirt Tuite was wearing beneath the red sweatshirt.

Prosecutors said Tuite was in the area of the Crowe residence the night of the murder, asking for a friend named "Tracy." Evidence also has been presented since the start of the trial that the defendant liked to carry a knife.

But Tuite's attorneys have told the jury that a tripod used to take photos in the victim's room may have gotten blood on it, then come in contact with Tuite's sweatshirt in the lab.

The defense also suggested that two Escondido officers who were at the crime scene came in contact with Tuite in a police holding cell and could have contaminated the T-shirt.

A defense expert who conducted a crime scene re-enactment will testify that it is more likely the seventh-grader was killed by two assailants, one holding a comforter over her and the other stabbing her, attorney William Fletcher told the jury in his opening statement.

Tuite, a diagnosed schizophrenic initially dismissed as being too clumsy to commit the killing, was charged after the San Diego County Sheriff's Department took over the investigation from Escondido police.