ELLSWORTH — It has been nearly 50 years since notorious criminal Myles J. Connor Jr. stepped foot inside the old brick building at 40 State St.

The last time he was there, when it was the old Hancock County Jail, he confronted a jail guard with a bar of soap he had blackened with shoe polish and carved into the shape of a gun. He used the fake firearm in a brazen escape from the jail that earned him five days of freedom — two of which he spent hiding in the attic of the Ellsworth Public Library — before he was snagged in a manhunt in the neighboring town of Hancock.

Now 71 years old and a resident of Blackstone, Mass., Connor was back at the old Ellsworth jail on Wednesday with a documentary film crew, recounting his first major criminal incident in a decades-long career of flamboyantly breaking the law. Balding with gray hair, he wore a long beige winter coat to stay warm inside the chilly building.

“I had no idea the commotion that I started by this stunt,” Conner said Wednesday of his daring summertime jail break in Hancock County when he was 22 years old. “And of course they had helicopters and guys with bloodhounds and the whole thing after me.”

Connor first gained attention in the 1960s as leader of a Boston-area rock band called Myles and the Wild Ones. He added to his reputation over the years with several high-profile art thefts and, though he was in prison at the time, has been linked to the infamous 1990 Isabella Stewart Gardner Museum art heist in Boston. He also has been accused of assaults, drug trafficking, shooting a police officer, and of murdering two Boston women in 1975, the last of which he eventually was acquitted.

On Wednesday, Connor recounted how while visiting relatives 49 years ago in Sullivan, he was captured after police caught him stealing antiques from a local dead woman’s house. A copy of his 2009 book, “The Art of the Heist,” lay on a table in the old jail booking room while cameras recorded Connor looking in a dusty jail cell and talking to relatives of Merritt Fitch, the sheriff who ran the jail at the time of his escape.

Dorothy “Dot” Fitch, the wife of the now-deceased former sheriff, said she cooked hot meals for inmates at the jail, including Connor.

“This is the first time I’ve seen him since I saw the back of him running out the door,” she said.

Ernest Fitch, the sheriff’s son and himself a former detective with the Hancock County Sheriff’s Office, said he was in the attached house where his family lived when Connor escaped. Recalling the commotion, he said his father got on the phone and called for assistance after Connor ran down the hill and jumped into the Union River.

Connor, whose grandfather was from Sullivan, used to travel in the summers from Milton, Mass., where his father was a police sergeant, to visit his grandfather’s family. He already had developed an interest in acquiring art and antiques when, one July night in 1965, he heard his relatives talking about a neighbor.

“I was at the dinner table at my granduncle’s house and I remember them talking about how sad it was that Mrs. so-and-so had passed on and her children were going to get everything that she had and she despised her children,” Connor said. “Being aware there was this house filled with antiques and stuff, I decided to take a look.”

Connor went to the dead woman’s house and was carrying a grandfather clock out to his car when a sheriff’s deputy, responding to a tip, pulled into the driveway. But it wasn’t the clock in his hands that worried Connor when he saw the officer, he said.

“In the trunk of my car I had some (illegal) firearms, heavy-duty firearms that I had brought up to Maine to do some target practice with,” Connor said. “They were machine guns.”

Connor got into a “tussle” with the deputy, snatching away his gun and shooting out the communications radio in the cruiser before he drove off in his own car. He was apprehended a short distance away on Route 1 by other officers responding to the call.

He was taken to the Ellsworth jail but soon hatched his escape plan. Officials would not let him out on bail, he said, and he was desperate to get back to his apartment in Revere, Mass.

“Back in Revere, my apartment was filled with high-quality antiques,” Connor said.

Among them was a silver plate made by Revolutionary War hero Paul Revere that had been stolen from Harvard University’s Peabody Museum. He was concerned that people he knew back home would help themselves to the valuables while he was locked away in Maine.

So about 8 p.m. July 26, 1965, Connor sprung into action. He brandished the blackened soap at a guard, knocked him down and ran out through the booking room entrance, down the hill behind the jail and jumped into the Union River. After seeing people with flashlights on the far side of the river, he swam back to the eastern bank and ran into the library, next to the jail.

“I reposed in the library for two days,” Connor said.

He found a ladder and hatch that led into the attic and crawled up, kicking the rolling ladder away as he went.

Two days later, he snuck out of the library, walked east a few blocks through Ellsworth and then followed railroad tracks east toward Hancock. He lived in the woods for a few more days until, after being spotted a few times, he ended up being caught in a police dragnet.