Monserrat Rivera‑Romero, a three‑year‑old Hispanic/Latina girl, was last seen in Oxnard, California on **January 22, 2005**, at approximately age 3, standing about 39 inches tall and weighing around 39 lbs, with brown hair and black eyes. Her disappearance is officially listed under Ventura County District Attorney’s case 2009‑027677, and in NamUs under case number MP19879, with last contact recorded on that same date.
That day, Monserrat and her two siblings—Alejandra and Wesley —were taken by their non‑custodial father, Alejandro Rivera Avina. Law enforcement has characterized the incident as a parental abduction. Authorities believe that he transported the children across the border to Mexico shortly after January 22 and failed to return them to the custodial parent. By August 2005, a warrant was issued for his arrest on charges of unlawful flight to avoid prosecution; however, as of the most recent updates, neither he nor the siblings have been located.
Although the case was added to public databases in subsequent years, and advocacy and search efforts continue, Monserrat remains missing. Records from *for the lost* indicate all three children—Monserrat, Alejandra, and Wesley—were eventually located safe in April 2021, but these updates were documented only in archival “located” records; public case files as of the latest update still list Monserrat as missing.
At the time of disappearance, Monserrat was described as a Hispanic female child with brown hair and black eyes, measuring approximately 3′3″ in height and weighing around 39 pounds. Her siblings’ descriptions were also recorded: Alejandra and Wesley . The Ventura County District Attorney’s Office holds jurisdiction and issued the official case number MP 19879.
Search and awareness efforts over the years have included public alerts and inclusion in missing‑person databases. Despite these efforts, no confirmed sightings or verified leads have been publicly reported since the original abduction. The case remains open and active, with law enforcement urging anyone with information to contact the Ventura County District Attorney’s Office or the California Department of Justice missing‑persons hotline .
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This account is compiled solely from publicly available sources and reflects the official records as of mid‑2025.Last Seen: Jan 22, 2005
