A San Mateo County sheriff's deputy accused of using excessive force on inmates at the Maguire Correctional Facility in Redwood City pleaded not guilty on March 15 to the charges against him.

Blake Lycett, 42, allegedly beat three inmates in August 2018. Two of the incidents happened on Aug. 18, while the inmates were being booked, according to prosecutors. The incidents were caught on camera, they said.

Luis Cardenas, one of the victims, had been arrested on suspicion of being drunk in public and had allegedly been uncooperative. Lycett allegedly jumped on top of him and struck the man in the back and in the back of the head.

Milan Jackson was arrested on suspicion of trespassing. Prosecutors said Jackson was also uncooperative during the booking process, and that Lycett struck him multiple times.

Four days later on Aug. 22, Lycett allegedly took inmate Zephaniah Coon to the ground and kneed him repeatedly into the torso before pushing the man's head into a closed elevator door for refusing to go back into his cell.