Marc Alexander Simon arrest photo. Source: Walnut Creek PD
6 years, 8 months for 28-year-old Marc Alexander Simon
Occurred in library restroom
By Ted Asregadoo, PIO, Office of the Contra Costa County District Attorney
Martinez, California – A Walnut Creek man was sentenced today in Contra Costa County Superior Court after entering guilty pleas to felony charges of sexual abuse of a minor and aggravated possession of child sexual abuse material.
28-year-old Marc Alexander Simon (born 12/25/96) was sentenced by the Honorable Charles Burch on June 26th, 2025, to six years and eight months in state prison. Simon was further ordered to register for life as a sex offender upon his release from custody.
The offenses for which Simon was sentenced occurred on April 11, 2024, when Simon followed a child into a restroom at the Walnut Creek Library and sexually abused the minor. The child reported the incident to an adult, who contacted the Walnut Creek Police Department.
Walnut Creek Police detectives used security cameras to quickly identify Simon’s vehicle as he left the scene. Police tracked him to another location in Walnut Creek, where he was arrested and booked into the Martinez Detention Facility. An iPhone seized during his arrest was forensically examined, revealing hundreds of images and videos of child sexual abuse material.
The transient man was arrested for lewd acts upon a child and attempted kidnapping. Simon has been in custody since his arrest and will begin to serve his sentence immediately. (See related article)
District Attorney Diana Becton said: “The swift investigative work by Walnut Creek Police and our Internet Crimes Against Children Task Force was crucial in holding the defendant accountable. This case demonstrates our unwavering commitment to protecting children in our communities from those who prey on them.”
Deputy District Attorney Ashley Torres from the Sexual Assault Unit prosecuted the case. The Walnut Creek Police Department Investigations Unit led the investigation with the assistance of the Contra Costa County Internet Crimes Against Children Task Force.
According to the Contra Costa County Sheriff’s Office, the five-feet, six-inch tall, 160-pound Simon is Hispanic and being held in the Martinez Detention Facility.
Case No. 01-24-01623 | The People of the State of California v. Simon, Marc Alexander
Allen D. Payton contributed to this report.
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