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Utah County prosecutors have filed charges against Willian Leonard Butcher after detectives identified three more sexual abuse victims, on top of the 12 to which Butcher had allegedly admitted on his own.

Butcher, 19, was charged Thursday in 4th District Court with 16 counts of first-degree felony aggravated sexual abuse of a child, seven counts of second-degree felony forcible sexual abuse and one count of first-degree felony sodomy on a child. The charges carry heavy prison sentences if he's convicted: 25 years to life for the sodomy charge, 15 years to life for each aggravated sexual abuse charge and up to 15 years for each forcible sexual abuse charge.

And he allegedly admitted to his crimes voluntarily.

Last week, the Provo teenager walked into the Provo Police Department and told officers he had abused 12 people, according to charging documents. Investigators say Butcher told them the victims ranged from infants to a 19-year-old man. And while Butcher claimed he had abused his first victim when he was 14, most of it happened when he was an adult, and as recently as last month, according to charges.

Detectives later identified three more victims as they investigated Butcher's claims, said Lt. Mathew Suifanua, spokesman for the department.

Butcher told police that most of the alleged abuse occurred in Provo, though some also happened in San Juan County and other places in southern Utah, according to the charges. He also admitted that he sexually abused a 14-year-old boy when he was 17 at a Boy Scout camp in Arizona — though he cannot be charged in Utah for that alleged abuse, the charges add.

After his admission to police, Butcher was arrested and booked into Utah County jail. His cash-only bail is set at $40,000.

Siufanua didn't know why Butcher admitted to the alleged crimes.

Butcher has no prior criminal history, according to a search of Utah court records — not even a speeding ticket.

mmcfall@sltrib.comTwitter: @mikeypanda