Monica Nanette Weems was 20 when she was last seen on August 15, 1990, in Richmond, California. She was described as 5 feet 2 inches, about 125 pounds, with brown hair and brown eyes. Monica was known to frequent the area around 7th and Pennsylvania in Richmond, which may be relevant to where she was last seen or who might have seen her that day.

Her disappearance remained unresolved for decades and was added to the NamUs database in 2023. Authorities say few clues have surfaced and the case is still open. If anyone remembers Monica, saw her around 7th and Pennsylvania on or near August 15, 1990, or has other information that could help, contact local law enforcement.