A 77-year-old inmate deemed 'too old' to be a threat, and who was freed from prison after serving 25 years for murdering his wife, has been jailed for a second time for killing another woman in an identical fashion.

Albert Flick, 77, was sentenced to 25 years in prison in 1979 after stabbing his wife 14 times in front of their daughter.

He was released after 25 years in 2004 but went back to jail in 2010 for assaulting another woman.

In 2014, he was released because he was deemed too old to be a threat.

Last year, he stabbed a homeless 48-year-old mother 11 times in broad daylight in Lewiston, Maine, in front of her children after stalking her for days.

Albert Flick, 77, is shown on Monday at his trial in Auburn, Maine. He wad convicted of murder on Wednesday, his second murder conviction after killing his wife in 1979

In 1979, Flick killed his wife, Sandra, in front of their daughter (above together) by stabbing her 14 times

In 2018, he struck again, killing 48-year-old Kimberly Dobbie, a homeless mother who he had become infatuated with

He was convicted of murder on Wednesday and is yet to be sentenced but will likely now spend the rest of his life in prison.

Assistant Attorney General Bud Ellis told jurors in his closing argument that Flick knew Dobbie was going to be leaving town and thought to himself, 'If I can't have her, I will kill her.'

In the days before the murder, he trailed her and her children around the town where they were living, to Dunkin' Donuts, a local library and to the bus shelter.

Among those who testified were friends of the woman who said that she tolerated his affection but did not want it.

Flick is shown moments before the murder in 2018 as he waited for a moment to strike outside a laundromat in Lewiston, Maine

Allan Lobozzo, his defense attorney, said there had been no indication his client posed a threat.

Dobbie's injuries were severe. She was stabbed so many times that it pierced her heart and her lung.

Her 11-year-old twin sons witnessed the killing and it was also caught on surveillance cameras.

Flick listened to the guilty verdict through headphones because he is so hard of hearing. He is shown standing next to his attorney, Allan Lobozzo

The jury from his most recent trial were not told about his previous crimes but they took only 40 minutes to find him guilty.

Flick is shown in his 2018 mugshot

The elderly man said nothing throughout the trial.

He had to listen through headphones to the verdict though it is not known why.

Two days before the killing, he bought a pair of knives from a Walmart.

He then waited, on the day of the murder, until the sidewalk was clear of pedestrians to attack her.

She was sitting on a step outside a building, talking on her cellphone at the time.

Prosecutors described how he was seen walking up to her, reaching into the small of his back and retrieving the knife then plunging it into her body without warning as her children watched.

The attack was intervened by a witness who testified at the trial that he 'drop kicked' Flick and kept his foot on his neck until police arrived.

The stabbing was caught on surveillance cameras at the laundromat

He said he heard Dobbie telling the older man to leave her alone beforehand.

Flick never offered an explanation for the killing.

He submitted a not guilty by way of insanity plea before the trial began but withdrew it.

He will be sentenced in August and faces life behind bars. Maine does not have the death penalty.

His daughter with the wife he murdered is now an adult. She said of the second killing that the judge who released him from prison should be forced to explain to the woman's sons why she is no longer alive.

'The boys are the ones that are going to live with it. I think the judge should explain to them, tell them, tell them how come they had to watch their mother be slaughtered on the street,' she told WMTW.