A 25-year-old gymnastics coach was arrested Wednesday in Orange County after allegations that he groomed and sexually abused a minor.
Allegations and Background
Jacob Alexander Demmin, 25, was taken into custody by the Orange County Sheriff’s Department’s Special Victims Detail following reports that he groomed a minor female and engaged in an inappropriate sexual relationship with her. The allegations stem from a 2021 incident while Demmin worked as a gymnastics coach at Firestorm Free Running and Acrobatics Gym in Santa Ana and Westminster. The sheriff’s department posted the claim on social media, stating that the victim reported grooming, inappropriate communication, and a sexual relationship with her while she was a minor.

Victim’s Account
The victim reached out to authorities after learning that Demmin was still coaching minors, prompting the department to investigate. According to the department, the victim described how Demmin groomed her, communicated inappropriately, and had an inappropriate sexual relationship with her during her minor years.
Current Employment and Investigation
Demmin is currently employed as a gymnastics coach at Ultimate Ninjas Gym in Anaheim Hills. Because of his ongoing access to minors through his job, investigators believe there may be additional victims.
Legal Charges and Detention
He was booked into Orange County Jail on suspicion of sodomy with a person under 18 years old, contacting a minor with the intent to commit lewd acts, sexual penetration with a foreign object, annoying or molesting a victim under 18, and unlawful sex with a minor, according to the sheriff’s department.
Call for Information
Anyone with information about the case is urged to contact the Orange County Sheriff’s Department at 714-647-7419 or 714-647-7000. Anonymous tips can be submitted to Orange County Crime Stoppers at 855-TIP-OCCS.
Key Takeaways
- Jacob Alexander Demmin, 25, arrested for grooming and sexual abuse of a minor.
- Victim reported grooming and sexual relationship in 2021 while Demmin coached at Firestorm Free Running and Acrobatics Gym.
- Authorities suspect additional victims due to Demmin’s current role at Ultimate Ninjas Gym.
The arrest highlights ongoing concerns about safeguarding minors in youth sports programs and underscores the importance of reporting suspected abuse promptly.

