A Cranberry Township man will spend up to 30 months in prison for assaulting a teenage girl, beginning about seven months after he was released from prison for assaulting another teenage girl.

Joseph Butler, 24, on Thursday was sentenced by Butler County Judge William Shaffer to serve 12 to 30 months in prison followed by 90 months of probation.

Butler, who pleaded guilty to statutory sexual assault and a felony count of corruption of minors, reportedly had sex with a 15-year-old girl 50 times between October 2013 and June 2014.

The victim did not appear at the sentencing hearing.

Before this assault in March 2013, Butler pleaded guilty to statutory sexual assault of a different 14-year-old girl.

Based in part on the new conviction, Judge Shaffer last month declared Butler a sexually violent predator and ordered him to register his whereabouts with state police for the rest of his life.

The judge made the decision after a member of the state’s Sexual Offender Assessment Board reviewed Butler’s case, and in May told Shaffer that Butler suffers hebephelia, a mental health disorder relating to sexuality.

The board member testified that Butler meets the criteria to be declared a sexually violent predator.

However, a psychiatrist hired by the defense, Dr. Robert Wetstein, disagreed with that recommendation and testified last month on Butler’s behalf.

Wetstein said there wasn’t sufficient data to determine the defendant suffers a mental health disorder because the victim in the new case, who was under age when the activity began, turned 16 within three months of the start of the allegations. The doctor said mental health disorders are diagnosed based on behavior over six months.

During Thursday’s sentencing, the judge also revoked Butler’s probation in the old case.

Tracy Veri, who has been Butler’s probation officer on the old case since 2013, testified that Butler while on probation did not comply with the rules. Veri said he “lied and manipulated” the system to avoid going to sexual offender treatment.

“He rewrites rules as it suits his needs,” Veri testified.

The judge, in response, resentenced Butler to serve 18 to 36 months in prison on the old case. However, Butler was immediately paroled for time served for that case, and now must finish the sentence on the new case.