A city man who sexually assaulted a 12-year-old boy at knifepoint inside the YMCA will spend 5½ to 16 years in state prison.

Jason M. Taylor, 36, pleaded guilty to aggravated assault, indecent assault and unlawful restraint. He was sentenced Tuesday by Butler County Judge William Shaffer.

According to court records, the boy told police that Taylor was a stranger to him in June 2013 when he attacked him in the Butler YMCA on North Washington Street.

According to court records, Taylor grabbed the boy by the throat. He held a utility knife to the boy’s face, led him into a bathroom stall and warned him not to scream.

After locking the stall, Taylor kissed and fondled the boy and removed some of the boy’s clothes, according to court records.

The boy heard someone walk into the bathroom and yelled for help. Taylor unlocked the stall door and ran out. But several YMCA members who heard the boy’s cries rushed to help, stopping Taylor and holding him until police arrived.

Assistant District Attorney Mark Lope, who prosecuted the case, said Taylor was evaluated by a member of the state’s Sexual Offender Assessment Board who determined Taylor does not meet the criteria to be deemed a sexually violent predator.

However, due to the indecent assault conviction, Taylor still must register his whereabouts with the state police for the rest of his life.

He was given the opportunity to speak during sentence court, but declined.

Defense attorney Terri Schultz said after court only that the attack was not premeditated.

“It’s one of those unfortunate things that just happened,” she said.

The victim also did not speak. A written statement was submitted to the judge on his behalf. It was not read during the hearing and is not public. The victim is not being identified due to the circumstances.

Court records show Taylor, who received credit for 440 days he already spent in prison awaiting the resolution of this case, has several prior convictions for forgery and theft between 2002 and 2008 in Butler, Allegheny and Westmoreland counties.