Convicted Sex Offender Living in Rancho Cucamonga Arrested for Failure to Register

Convicted Sex Offender Living in Rancho Cucamonga Arrested for Failure to Register

RANCHO CUCAMONGA, Calif. – A Rancho Cucamonga man who has volunteered as a coach for multiple youth sports programs was arrested for failing to register as a sex offender.

John Frederick Aldridge, 48, was convicted of various sexual offenses against an adult victim in 1988. He served time in the California Youth Authority. As part of his sentence, he was ordered to register to register as a sex offender for the rest of his life. Aldridge registered in 1997, living at a home in the 5500 block of Vinmar Avenue in the City of Rancho Cucamonga. After that registration, he did not register and in 2000 authorities learned that he was living in Washington.

Aldridge eventually returned to California and still, did not update his registration. Officers with the California Highway Patrol stopped a vehicle on February 25, 2019.  Officers made contact with Aldridge and learned that he was an out of compliance sex offender who was living in Rancho Cucamonga. Officers arrested Aldridge booked him into the county jail.

The CHP contacted Rancho Cucamonga detectives to assist in the investigation. On February 26, 2019, Aldridge posted a $50,000 bond and was released from custody. Once released, Aldridge again failed to register his home address as required. Detectives also learned that over the past few years, Aldridge volunteered as a coach for youth football teams in Fontana and Rancho Cucamonga. He also currently volunteers at a youth sporting clinic in Upland.

A search warrant search was conducted at Aldridge’s home on March 7, 2019, and evidence was located to establish his residency for the past few years. He was arrested and booked for failure to register and is being held in lieu of $100,000 bail. He will be arraigned at the Rancho Cucamonga Superior Court on March 1, 2019.

.If you have any further information regarding this case, you are urged to contact the Rancho Cucamonga Police Detective Division at (909) 477-2800. Callers wishing to remain anonymous can call the We-Tip hotline at 1-800-78-CRIME (27463) or you may leave information at

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