A 34-year-old San Francisco man is behind bars in San Joaquin County after detectives say he met a 12-year-old victim through a social media application and traveled from San Francisco on multiple occasions to meet with her. Matthew Solomongiovanni Martin was booked into San Joaquin County Jail on July 30 on a slate of felony charges tied to child sexual abuse and exploitation.
San Joaquin County Sheriff's Office detectives arrested Martin last Thursday after locating him as part of an investigation into the sexual exploitation of a child, according to the San Joaquin County Sheriff's Office. Investigators allege Martin engaged in repeated communications containing sexually explicit content with the child before traveling to meet her in person more than once. The San Francisco Police Department assisted San Joaquin County detectives during the arrest, the sheriff's office said.
Inmate booking records show Martin faces an extensive list of felony counts, including PC 288.4(B) for arranging a meeting with a minor, PC 269(A)(1) for aggravated sexual assault of a minor, PC 288(A) for lewd acts with a child under 14, PC 261.5(D) for unlawful sexual intercourse, PC 288.2(A)(1) for sending harmful matter to a minor, and PC 207(B) for kidnapping a child under 14 to commit lewd acts, according to Recently Booked. Martin remains legally presumed innocent, and formal charging documents from the District Attorney's office are still pending.
What the Charges Could Mean
The charge of sending harmful material to a minor under PC 288.2(a)(1) alone carries penalties of up to five years in state prison, fines as high as $10,000, and mandatory lifetime Tier Three sex offender registration, per the Kann Law Office. Separately, under Proposition 83, known as Jessica's Law, simply contacting a minor online with intent to commit a felony sex offense can be prosecuted as an attempted crime carrying the same state prison penalties as the underlying offense, up to eight years, even if no in-person meeting ever takes place, according to attorneys at Cron Israels and Stark.
The sheriff's office said it remains committed to protecting children and holding offenders accountable, urging parents and guardians to monitor their children's online activity and to talk with kids about the dangers of communicating with strangers on social media.
Part of a Larger Regional Effort
The San Joaquin County Sheriff's Office is a participating member of the Sacramento Valley Hi-Tech Crimes / Internet Crimes Against Children Task Force, a regional coalition dating back to the 1990s that now includes more than 120 affiliate agencies across 30 Northern California and Central Valley counties, according to the Sacramento County Sheriff's Office. That task force has previously run undercover stings such as Operation SPF-13 in July 2025, which used online decoys posing as children under 13 and led to 13 felony arrests when suspects traveled to meet who they believed were minors.
The arrest also lands amid a dramatic nationwide rise in reported online enticement cases. Mid-year 2025 data from the National Center for Missing & Exploited Children showed CyberTipline reports of online enticement jumped 77 percent compared to the same period the year before, climbing from 292,951 to 518,720 reported cases nationwide, per HSToday.
Aggressive Local Prosecutions
San Joaquin County District Attorney Ron Freitas has made child sexual abuse cases a clear priority this year, securing a series of severe sentences against convicted predators. In July, his office announced a 49-year-to-life sentence against Rodney Smith, following a 50-year-to-life sentence secured in April against Gerardo Garcia Aguilar, according to the San Joaquin County District Attorney's Office.
Victims and families connected to child exploitation cases in the county have access to co-located support through the San Joaquin County Family Justice Center in Stockton, which brings together the District Attorney's Bureau of Investigations, PREVAIL, and the Child Abuse Prevention Council under one roof, according to the San Joaquin County Family Justice Center. Complex exploitation cases originating in the county can also draw federal support through Project Safe Childhood, a Department of Justice initiative launched in 2006 to coordinate federal, state, and local resources against child predators.
Martin's case follows a string of recent child exploitation arrests in the region. Hoodline previously reported on a Manteca man facing 26 felony counts, as well as a separate case in which a CyberTip triggered a Manteca arrest over suspected child sex abuse files. As of now, no additional details on Martin's court dates or formal charges have been released.
