The victim, a 50-year-old woman, complained to her family that she was being assaulted in the facility, according to prosecutors.
Police said a family member called police on July 2 to report the sexual assaults.
The family member then installed a camera in the woman’s room.
“The camera captured the defendant sexually assaulting her twice a day, on two different days. The videos did not capture the totality of the sexual abuse the victim suffered at the hands of the defendant,” prosecutors wrote in charging documents.
In a probable cause document, police said that when they contacted Hamzat he said he had not had any inappropriate sexual contact complaints and denied having done anything wrong.
When Hamzat was shown video of himself abusing the woman, police said he continued to maintain that he was doing patient care.
Hamzat was booked into the King County Jail on July 3 for investigation of rape.
He remains in jail in lieu of a $200,000 bail.
His arraignment, where he will enter a plea, is expected later this month.