A pedestrian walks down Sherman Street in November 2022 near the spot where a man was found shot the night before. Brianna Soukup/Staff Photographer

The man charged in a deadly shooting in Portland’s Parkside neighborhood two years ago has agreed to plead guilty to manslaughter.

Tristin Chamberlain, 23 Cumberland County Jail

Tristin Chamberlain, 23, of Portland originally pleaded not guilty to a murder charge in the November 2022 death of 26-year-old Tyler Flexon, of Portland, but that charge was dropped during a hearing in Cumberland County Superior Court on Monday.

He chose to enter an open plea, meaning his sentence will be determined later, to the manslaughter charge, according to the Maine attorney general’s office. His sentencing has not been scheduled yet, but a Cumberland County clerk said it will likely happen in November.

Prosecutors say Chamberlain shot Flexon after a fight inside the Mellen Street Market. He later turned himself in to the York County Sheriff’s Office.

Chamberlain’s attorney, Amy Fairfield, was in court Thursday and not available to answer questions about the plea, according to her office.

In his obituary, Flexon was described as a hardworking man who loved woodworking, fishing and the outdoors. He grew up in the Pocono Mountains of Pennsylvania and loved his friends and family.

Police pieced together various witness statements and security camera footage to determine that Chamberlain’s girlfriend was working at the now-shuttered market when she, Flexon and Chamberlain got into a serious argument, according to court documents written by a Portland police detective.

Chamberlain was only in the video briefly, but he appeared to be holding a gun, according to the affidavit. Flexon stayed in the market after Chamberlain left, shouting and looking at a window. Chamberlain’s girlfriend appeared to shake her hands toward Flexon and the window and mouth the words “go home,” the detective wrote.

One witness described seeing a man in a royal blue jacket banging on the market windows. Many people heard gunshots and told police that the shooter was wearing a royal blue puffy jacket and overall black clothing with slide-on shoes. Several witness accounts described the two men yelling at each other, and one person heard a man threaten to shoot. One witness, who was sitting on his porch, said he saw one man shoot the other in the stomach and run down Mellen Street toward Park Avenue.

Authorities found bullets in a magazine in Chamberlain’s apartment on Grant Street with the same stamp as a shell casing found where the shooting occurred on Sherman Street, according to court documents.