Investigators searching the Arroyo Grande home of Susan Flores, the mother of convicted killer Paul Flores, found scientific evidence that human remains were once present at the property, San Luis Obispo County Sheriff Ian Parkinson announced Friday. The discovery came nearly three decades after 19-year-old Kristin Smart vanished from the California Polytechnic State University campus over Memorial Day weekend in 1996.
Her body has never been recovered.
That fact has haunted the Smart family for 30 years. And it is the reason sheriff's investigators, armed with a search warrant, spent the week combing through the Arroyo Grande property with ground-penetrating radar, soil testing, and specialists in human decomposition. What they found, the sheriff said, was enough to keep digging.
Parkinson, speaking at a press conference, laid out findings that were cautious but pointed. As the New York Post reported, the sheriff told reporters that soil-vapor sampling and other forensic methods returned positive results for indicators of human decomposition.
"We believe that, based on what we're looking at, evidence, wise scientific evidence, that a human remains were there at one time."
He stopped short of identifying the remains as Smart's. "So we can't call it Kristin, but you know, we think there's, there's evidence to support human remains there," Parkinson said.
The sheriff made clear the search is far from over. He pledged investigators would stay on the property until they had checked everything. AP News reported Parkinson saying flatly, "We are not leaving that house until we are sure that we have checked everything." The search may require additional warrants for digging or excavating cement on the property.
The warrant served earlier in the week forced occupants to vacate. "The warrant that we obtained means the occupants of the residence, once we serve it, have to depart and cannot return to the residence. It's not unusual," Parkinson said.
Kristin Smart was a 19-year-old college freshman from Stockton when she disappeared on the night of May 25, 1996. She had attended an off-campus party near California Polytechnic State University. Friends, deciding she was too intoxicated to go home by herself, watched as Paul Flores, then also 19, walked her back toward her dorm.
She was never seen again.
Prosecutors alleged Paul Flores attempted to rape Smart, possibly in his dorm room, that night. He remained a suspect for over two decades before a jury convicted him of murder in 2022. He was sentenced to 25 years to life in prison. His father, Ruben Flores, was acquitted of helping him.
But the conviction did not answer the question the Smart family has asked since 1996: where is Kristin? That question has driven ongoing investigative efforts by San Luis Obispo County law enforcement, even after the trial ended.
The search of Susan Flores' home employed techniques that have advanced significantly since the original investigation. Investigators brought in specialists who used soil-vapor testing, a method that detects compounds associated with human decomposition, alongside ground-penetrating radar. Breitbart reported that Tim Nelligan, one of the specialists, said his team has "come up with a methodology to assess soil vapor" and its relation to "human cadaver decomposition."
Investigators collected samples not only from Susan Flores' yard but also from a neighboring property. Chris Lambert, who has followed the case closely, noted that "this property in particular has been overlooked for quite some time."
The fact that investigators zeroed in on the mother's home, not the father's property, which had been searched previously, raises obvious questions. The source material does not explain why this property drew renewed attention now, though the deployment of newer forensic tools suggests investigators may have identified leads that older technology could not detect.
Cases involving long-missing persons and delayed forensic searches are not unique to San Luis Obispo County. Similar investigative sweeps in other jurisdictions have underscored how difficult it can be to recover remains years or decades after a disappearance.
District Attorney Dan Dow weighed in Wednesday, before the sheriff's Friday announcement. His statement framed the ongoing search as a commitment that extends beyond the courtroom conviction.
"Since the jury convicted Paul Flores for the murder of Kristin Smart, the District Attorney's Office has continued working in coordination with the Sheriff's Office to fulfill our shared commitment to the Smart family and this community: to bring Kristin home."
Newsmax reported a fuller version of Dow's remarks, in which he added: "While those responsible for Kristin's death, and those with knowledge of her whereabouts, could provide answers at any time, we remain firmly committed to using every lawful tool available to locate Kristin's remains and to support her family until she is brought home."
That line, "those with knowledge of her whereabouts, could provide answers at any time", is worth pausing on. Paul Flores sits in prison. His father was acquitted. Susan Flores has not been charged with any crime. Yet investigators are tearing through her home with radar and decomposition experts. The DA's words suggest officials believe someone who knows where Kristin Smart's remains are has chosen silence over accountability.
A spokesperson for the Smart family told the New York Post the family remains hopeful.
"We remain hopeful that this current search will be successful and look forward to the outcome. Our family greatly appreciates the efforts, dedication, and commitment of Sheriff Ian Parkinson, Detective Clint Cole, the San Luis Obispo Sheriff's Department, and the technical experts assisting with the execution of this search."
The spokesperson added that the family continues to draw strength from community support "far beyond the Central Coast." For a family that has endured three decades without answers, and without remains to bury, that kind of public solidarity matters. It is a reminder that ordinary people have not forgotten Kristin Smart, even if the system took 26 years to convict the man who killed her.
The persistence of unsolved or partially resolved disappearance cases across the country, from long-missing persons in Arizona to cold cases in California, reflects both the limits of early investigations and the growing power of modern forensic science to reopen doors that were once closed.
Significant questions hang over this search. Authorities have not said whether any human remains were actually recovered, only that evidence of their presence was detected. The specific scientific tests that produced the positive findings have not been publicly identified beyond the general descriptions of soil-vapor sampling and radar. No agency or court has been named as the issuer of the search warrant.
Most critically, investigators cannot yet say whether the evidence ties specifically to Kristin Smart. The sheriff acknowledged as much. The gap between "human remains were here at one time" and "we found Kristin" is enormous, and the Smart family knows that better than anyone.
Additional warrants may be needed to excavate portions of the property, including areas with cement. The Washington Times reported that the sheriff confirmed digging could require further legal authorization, meaning this search could stretch on for days or weeks.
The broader pattern here is familiar and grim. A young woman disappears. Suspicion falls on one person almost immediately. Yet it takes a quarter-century to convict him, and even then, the victim's family cannot lay her to rest. The system secured a guilty verdict, but it has not yet delivered closure. Cases like this, and others involving missing Americans whose families wait in anguish, test whether law enforcement can finish what it starts.
Paul Flores is serving 25 years to life. The jury did its job. But a conviction without a recovered victim is an incomplete act of justice. The Smart family deserves to bring their daughter home. San Luis Obispo County officials, to their credit, appear to understand that.
Sheriff Parkinson and DA Dow have both signaled they will not walk away from this case simply because a prison sentence has been handed down. That is the right instinct. A family's grief does not end when the courtroom empties.
Somewhere in that Arroyo Grande property, the evidence suggests, a body was once laid. If it was Kristin Smart's, someone put it there, and someone may know exactly where it went. The law has tools to compel answers. It should use every last one.
