Flick was sentenced to 25 years in prison for the 1979 murder. He was released and was released in 2000 after 21 years for good behavior, The Washington Post reported.
By 2010, when he was in his late 60s, Flick had been convicted of assaulting two other women. Despite his record, the judge in the 2010 case sentenced him to four years.
"At some point Mr. Flick is going to age out of his capacity to engage in this conduct," Maine Superior Court Justice Robert E. Crowley said, according to the Portland Press Herald. "And incarcerating him beyond the time that he ages out doesn't seem to me to make good sense."
Judge Crowley retired in 2010. He hasn't responded to media requests for comment.
Flick is scheduled for sentencing August 9. He faces 25 years to life behind bars.
“I firmly believe this could have been prevented,” Elsie Clement, whose mother was stabbed to death by Flick in 1979, told the Press Herald last year of Dobbie's death. “There is no reason this man should have been on the streets in the first place, no reason.”