Lona Robertson, 40, vanished from her Santa Rosa, California home late at night on December 29, 1990. Her body was found on January 1, 1991, ending a short but agonizing disappearance for family and friends.

Investigators have been unable to determine the exact circumstances of her death, and no significant breakthroughs have been reported. The case remains one of Santa Rosa’s cold homicides, with many questions still unanswered about what happened during those final days.

If anyone knew Lona, saw her the night she left home, or has information that might help piece together her last movements, please come forward.