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…