Less than a month after being released from prison for sexually assault a Phoenix man is back behind bars for sexually assaulting a mentally ill man.
According to court documents, 20-year-old Robert Houston was sleeping at friend's house on January 8 when he sexually assaulted a man who has the mental capacity of a 10-year-old.
After waking up from the assault, the victim told Houston not to do what he was doing, but Houston followed him into the bathroom and sexually assaulted the man again.
Police say Houston admitted to them that he thought the man "had the mental capacity of an 8-year-old."
Arizona Department of Corrections records show Houston was admitted to prison on January 14, 2015 and was released on December 29 of last year.
Prior court records show he served prison time for criminal trespassing and for sexually assaulting a woman.
Police also say this is not the first time Houston has targeted the mentally ill. He was arrested in 2012 for sexually assaulting a 14-year-old boy who was also mentally disabled.
Houston is being held without bond on charges of sexual assault.