A registered sex offender is charged with sexually assaulting a 12 year-old Trumbull boy.

Walter Santiago, 54, of 800 Madison Ave. Apt. 3C in Bridgeport, turned himself in Thursday on two charges of aggravated sexual assault of a minor and risk of injury to a minor.

Police received a complaint this month, involving alleged assault on the boy. Santiago had become friends with the boy, whom he had me through a neighbor, according to police. Santiago was able to spend time with the boy alone, near his home, where the alleged assaults occurred.

Santiago is a registered sex offender with the state of Connecticut. He was held on a $1 million bond, according to police.

The investigation was handled by the Trumbull Police Detective Bureau.