The family of longtime missing California college student Kristin Smart is expected to testify on Thursday in the trial of the man accused of murdering her more than 26 years ago, and of his father who allegedly helped him hide Smart's body, according to reports. 

The San Luis Obispo Tribune cited NBC Dateline in reporting that family members of Smart, the 19-year-old college freshman who disappeared after an off-campus frat party in May 1996, will be called to the stand on Thursday. A pair of Monterey County juries has been empaneled to oversee the separate cases involving Paul and Ruben Flores

Paul Flores, a now-45-year-old man, is charged with murder in connection with Smart's presumed death. Ruben, his 81-year-old father, allegedly helped his son bury Smart’s body, but later unearthed and relocated the remains. 

Earlier on Thursday, Ruben Flores’ defense attorney, Harold Mesick, presented his opening statements on behalf of his client.

KRISTIN SMART TRIAL FOR PAUL FLORES AND HIS FATHER TO RESUME AS PLANNED ON THURSDAY

The court proceeding are not televised or streamed. News Channel 3-12 described how Mesick began to describe the ways in which the allegations against Ruben Flores – that he helped his son bury Smart’s body under the deck of his Arroyo Grande home – are improbable. 

He also emphasized to the court that investigators have not uncovered any DNA evidence.

Prosecutors have said Flores killed Smart on May 25, 1996, when both were freshmen at California Polytechnic State University in San Luis Obispo. Paul was allegedly the last person seen with Smart, who was said to have been intoxicated after they and others had attended an off-campus frat party over the Memorial Day weekend.

kristin smart paul flores murder trial

Left: Still-missing college student Kristin Smart; Right: Paul Flores (FBI / San Luis Obispo County Sheriff's Office via AP)

KRISTIN SMART CALIFORNIA TRIAL: PAUL FLORES', FATHER'S ATTORNEYS TRY TO POKE HOLES IN DECADES-OLD MURDER CASE

The state has said Paul Flores killed Smart in his dorm room while he tried to rape her when they were both freshman. A massive search ensued, but Smart’s remains were never found. 

"And while the entire community banded together to search for Kristin desperately, Paul and Ruben Flores did not join in," Deputy District Attorney Christopher Peuvrelle told the jury. "You will hear Ruben Flores would tear down missing posters of Kristin — tore down her smiling, beautiful face — called her a ‘dirty slut,’ all while her corpse was decomposing underneath his deck."

CALIFORNIA KRISTIN SMART TRIAL FOR PAUL FLORES AND DAD BEGINS 25+ YEARS AFTER COLLEGE STUDENT'S DISAPPEARANCE

Ruben Flores in court Kristin Smart trial

Ruben Flores, father of Paul Flores, sits in court Monday, Aug. 2, 2021, in San Luis Obispo, Calif. Kristin Smart disappeared during her freshman year at California Polytechnic State University in San Luis Obispo more than 25 years ago.  (David Middlecamp/The Tribune (of San Luis Obispo) via AP, Pool,File)

Defense attorneys tried to poke holes in prosecutors’ statements in their own opening remarks on Monday. Paul Flores’ lawyer also attempted to discredit the use of cadaver dogs and the forensic evidence to which prosecutors have pointed.  

The trial was "unexpectedly" delayed on Tuesday until Thursday, a court spokesperson said. 

Paul Flores arrest photo

FILE - This Tuesday, April 13, 2021, file photo provided by the San Luis Obispo County Sheriff's Office shows suspect Paul Flores who was taken into custody in the San Pedro area of Los Angeles for the murder of Kristin Smart. (San Luis Obispo County Sheriff's Office via AP)

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The trial is expected to take an estimated four months. Separate juries were selected from a pool of more than 1,500 Monterey County residents to oversee each case.