Yorba Linda, Calif. On Wednesday, Dec. 24, 2025, Orange County Sheriff’s Department Special Victims Detail (SVD) investigators arrested Jacob Alexander Demmin, 25, of Yorba Linda, following allegations he groomed and had an inappropriate s*xual relationship with a minor female.
In Dec. 2025, Special Victims Detail (SVD) investigators were contacted by the victim after she learned that Demmin was still coaching minor children. The victim reported that in 2021, while Demmin was employed as a gymnastics coach at Firestorm Free Running and Acrobatics Gym in Santa Ana and Westminster, he groomed her, engaged in inappropriate communication and had an inappropriate s*xual relationship with her while she was a minor.
During the investigation, SVD investigators learned that Demmin currently works as a gymnastics coach at Ultimate Ninjas Gym in Anaheim Hills, Calif.
Demmin was booked into Orange County Jail for PC 286 (B)(1), s*domy with a person under 18 years; PC 288.3(a), contacting a minor with the intent to commit l*wd acts; PC 287(C)(2)(A), s*xual penetration with a foreign object; PC 647.6(A)(1), Annoy or m*lest a victim under 18, and PC 261.5(C), unlawful s*x with a minor.
Due to Demmin’s access to minors through his employment, SVD investigators believe there may be additional victims. Anyone with information, or anyone who believes they may have been a victim, is urged to contact the Orange County Sheriff’s Department Special Victims Detail at 714-647-7419 or 714-647-7000. Anonymous tips may also be submitted to Orange County Crime Stoppers at 855-TIP-OCCS.
Statement from the Ultimate Ninjas Gym:
It was brought to our attention today that a former coach here at Ultimate Ninjas Anaheim Hills, Jacob Demmin, was arrested this morning on allegations related to an inappropriate relationship with a minor in 2021.
Although Mr. Demmin is not currently employed with us, and was not employed with us at the time of the allegations, we take this information extremely seriously. We want to make sure that everyone is aware out of an abundance of caution.
The news was devastating for us to hear as safety of our kids is of the utmost importance to us. All of our gym activity takes place in clear view of parents. We never allow coaches to be alone with students. And we have 24×7 security cameras throughout the gym.
Mr. Demmin was employed here from 10/1/24 to 11/28/25. There were no complaints or accusations during the time in which he was employed with us.
We will of course be cooperating with authorities in any way necessary.
If you have any relevant information related to Mr. Demmin, we encourage you to contact the OC Sheriff’s Department at 714-647-7419. And please reach out to us if you have any questions or concerns.
Penalties faced by Jacob Alexander Demmin
Jacob Alexander Demmin, 25, faces significant criminal penalties following his December 2025 arrest for multiple alleged s*x crimes involving a minor. The specific penalties for each charge under the California Penal Code are detailed below:
- S*domy with a Person Under 18 (PC 286(b)(1)): This charge is a “wobbler,” meaning it can be prosecuted as a misdemeanor or a felony.
- Felony: 16 months, 2 years, or 3 years in state prison.
- Misdemeanor: Up to one year in county jail and/or a fine of up to $1,000.
- Contacting a Minor with Intent to Commit L*wd Acts (PC 288.3(a)): A felony charge that carries the same term prescribed for an attempt to commit the intended offense.
- Prison Term: Typically 3, 6, or 8 years in state prison if the intended act was lewd conduct with a child.
- Fines: Up to $10,000.
- S*xual Penetration with a Foreign Object (PC 287(C)(2)(A)): Note that PC 287 typically refers to oral c*pulation; however, the booking description provided in the report specifies “s*xual penetration with a foreign object.”
- Forcible Oral C*pulation: If categorized under PC 287(c)(2)(A) as an act accomplished by force or fear, it is a felony punishable by 3, 6, or 8 years in state prison.
- Registration: Conviction of forcible acts under this section triggers mandatory lifetime s*x offender registration.
- Annoy or M*lest a Victim Under 18 (PC 647.6(A)(1)): This is typically a misdemeanor for a first offense, punishable by up to one year in county jail and a fine of up to $1,000.
- Unlawful S*x with a Minor (PC 261.5(C)): Known as statutory r*pe, specifically where the defendant is more than three years older than the minor.
- Penalty: As a “wobbler,” it can result in up to one year in county jail as a misdemeanor or a state prison sentence of 2 or 3 years as a felony.
Additional Consequences
- S*x Offender Registration: Most of these convictions require mandatory registration under PC 290. Depending on the final tier, this may require registration for 10 years, 20 years, or life.
- Professional Impact: As a gymnastics coach, Demmin faces the permanent loss of his ability to work with minors and the revocation of related professional certifications.
- Three Strikes Law: Felony convictions for these offenses can count as “strikes” under California’s Three Strikes Law, which can double the sentence for future felony convictions or lead to 25 years to life for a third strike.