David Edwin Koos, 67, was found fatally shot at his Santa Clarita home in a gated community on Rainbow Glen Drive on February 15, 2020. Deputies and paramedics arrived around 5:30 p.m.; the Los Angeles County Medical Examiner‑Coroner recorded at least one gunshot wound to his lower torso and ruled he died at the scene.

Homicide detectives detained a person present at the scene for questioning, but no arrests were announced. Investigators reviewed video showing a woman speaking with deputies and being examined by paramedics outside the home; her connection to the shooting has not been disclosed. The Los Angeles County Sheriff’s Department conducted forensic work and witness interviews and asked the public to contact L.A. Regional Crime Stoppers with information.

What did neighbors or anyone who knew David notice about his movements or visitors around February 15, 2020?