Katherine “Mangsat” Thomas, a 45-year-old Asian female from Glendora, California, vanished on October 12, 2023. She was last seen at Glendora Hospital, where she had been taken for treatment of a medical condition. Katherine is described as 5′0″ tall, weighing approximately 155 lbs, with black hair and brown eyes. At the time of her disappearance, she was dressed in a black shirt, black pants, and hospital-issued shoes.
That morning, Katherine was found by police and transported to the hospital. While there, she contacted a friend or family member who later arrived on scene. She asked this individual to fetch a soda for her. Upon their return, Katherine had walked away and not been seen since. Although the details surrounding her departure are minimal—no known vehicle, direction, or possible destination—her disappearance has been classified as “endangered missing,” given her medical needs and repeated history of going missing.
Katherine’s case has a documented pattern of similar incidents; according to available reports, she had previously gone missing six or seven times, suggesting underlying factors such as health issues, disorientation, or other vulnerabilities. The Los Angeles Police Department’s Adult Missing Persons Unit is leading the investigation, with case number 230121868. Detective Felipe Campos is the point of contact for ongoing inquiries and updates.
Her disappearance is registered with several official databases, including NamUs and the California Attorney General’s missing person registry, both affirming the key personal details and the timeline. Despite these listings and public awareness efforts, no credible sightings or leads have emerged since that day, leaving her family and authorities deeply concerned.
If anyone has information on Katherine’s whereabouts or believes they may have seen her since October 12, 2023—especially in the Glendora area or surroundings—they are urged to contact the LAPD’s Adult Missing Persons Unit at 877‑275‑5273 or reach out to NamUs directly.
Her case remains active and unresolved, with no indication of foul play—but high risk due to her health vulnerabilities and repeated pattern of disappearance.Last Seen: Oct 12, 2023
