SALINAS — The man last seen with Kristin Smart, the college freshman who vanished from a California campus 25 years ago, is on trial more than a year after he was arrested on a murder charge along with his father, who is accused of helping hide her body.

Opening statements began Monday in Monterey County Superior Court in Salinas in the case against Paul Flores and his father, Ruben Flores, who is charged as an accessory. Both men have pleaded not guilty.

Paul Flores, now 45, was arrested in April 2021 at his home in San Pedro, nearly a quarter-century after Smart disappeared after being seen with Flores as he walked her home from an off-campus party where she reportedly got intoxicated. Officials declared Smart dead in 2002, but her remains still have not been located. The mystery of how she vanished from the scenic campus tucked against a verdant coastal mountain range is likely to be central to the trial.

Deputy District Attorney Christopher Peuvrelle described how Smart disappeared from California Polytechnic State University over Memorial Day weekend in 1996, the San Luis Obispo Tribune reported.

“In 1995, Stan and Denise Smart sent their oldest daughter Kristin to Cal Poly in San Luis Obispo,” Peuvrelle said in his opening remarks. “During her freshman year they looked forward every Sunday to a phone call from her — it was their ritual.”

That weekend, the call never came, Peuvrelle said.

Prosecutors maintain the younger Flores killed the 19-year-old during an attempted rape on May 25, 1996 in his dorm room at Cal Poly, where both were first-year students. His father, now 81, allegedly helped bury the slain student behind his home in the nearby community of Arroyo Grande and later dug up the remains and moved them.

Paul Flores had long been considered a suspect in the killing, but prosecutors only arrested him and his father in 2021 after the investigation was revived.

San Luis Obispo County Sheriff Ian Parkinson acknowledged missteps by detectives over the years and he credited a popular podcast about Smart’s disappearance called “Your Own Backyard” for helping unearth new information and inspiring witnesses to speak with investigators.

Investigators have conducted dozens of searches over two decades, but turned their attention in the past two years to Ruben Flores’ home about 12 miles south of Cal Poly in the community of Arroyo Grande.

Behind lattice work beneath the deck of his large house on a dead end street off Tally Ho Road, archaeologists working for police in March 2021 found a soil disturbance about the size of a casket and the presence of human blood, prosecutors said. The blood was too degraded to extract a DNA sample.

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San Luis Obispo Superior Court Judge Craig Van Rooyen ordered the pair to trial after a 22-day preliminary hearing in which he found a “strong suspicion” the father and son committed the crimes they were charged with, that a grave existed under Ruben Flores’ deck and it once held Smart’s remains.

Attorney Harold Mesick, who represents Ruben Flores, previously said the evidence unearthed was ambiguous. He said that soil under the deck had been dumped there after being excavated to lay a foundation nearby.

“It was a hot mess because it’s been previously excavated,” Mesick said. “If we even call it evidence, it is so minimal as to shock the conscience.”

Paul Flores was the last person seen with Smart on May 25, 1996.

He downplayed his interactions with her when he first spoke with police three days later, saying she walked to her dorm under her own power, though other witnesses said that she had passed out earlier in the night and Flores helped hold her up as they walked back to campus.

Flores had a black eye when investigators interviewed him. He told them he got it playing basketball with friends, who denied his account, according to court records. He later changed his story to say he bumped his head while working on his car.

At a preliminary hearing last year, prosecutors presented evidence that four cadaver dogs stopped at Flores’ room and alerted to the scent of death near his bed.

Van Rooyen ruled in favor of a defense request to move the trial out of San Luis Obispo County because it was unlikely the Flores’ could receive a fair trial with so much much notoriety in the city of about 47,000 people.

The case was moved 110 miles north to Salinas, a small city in the agricultural region where John Steinbeck set some of his best-known novels.

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Defense lawyer Robert Sanger previously said the evidence remained the same as it did in the 1990s when Paul Flores was the prime suspect but never charged with a crime.

“The evidence then and now is based on speculation and not proof of facts,” Sanger said in court documents.

Sanger has tried to pin the killing on someone else — noting that Scott Peterson, who was later convicted at a sensational trial of killing his pregnant wife and the fetus she was carrying — was also a Cal Poly student at the time.

Trial Judge Jennifer O’Keefe — who is a year younger than Kristin Smart would be today — however, has barred suggestions of alternate suspects unless Sanger can provide evidence of their direct involvement.

Separate juries were selected to weigh the evidence against each defendant. The trial is expected to last about four months.