Four years after allegations surfaced that a well-known Butler doctor had sexually assaulted boys, the last of the pending charges was resolved Monday in Butler County Court with a plea and sentence.

Dr. David Evanko, 59, pleaded guilty to sexually assaulting two boys he had been contracted to treat medically while they were residents of Summit Academy.

Evanko was sentenced to serve 5 1/2 to 14 1/2 years in prison. The sentence will run and expire concurrently with the 6-to-15 year sentence Evanko already is serving for sexually assaulting a boy he’d met in the Boy Scouts in the 1990s.

The hearing marked the final in-court action on all matters. Because of that, both the defendant’s wife and the lead investigator used the opportunity to draw attention to what they believe to be flaws in the justice system illustrated by this case.

“I support him and believe in his innocence 110 percent,” said Casey Evanko, who’s been visiting her husband weekly at Camp Hill State Prison since he was sent there six months ago.

“These alleged victims are lying, but people facing these types of allegations just don’t stand a chance. We’ve both lost our faith in the justice system.”

But Robert McGraw, who was the state trooper who investigated and charged the doctor, said the system was actually stacked against the prosecution.

“David Evanko is a coward who physically and psychologically prays on children,” McGraw said. “Unfortunately, he won’t be spending the rest of his life in jail because of the statute of limitations. We have to abide by the law.”

McGraw said that in addition to the Boy Scout and two Summit Academy youths, investigators looked at credible accusations made by five other males. But prosecutors were barred from pursuing those allegations further because the statute of limitations had expired on their allegations, McGraw said.