Autopsies on four people killed by gunfire early Sunday in Central reveal more information on the slayings of three brothers by an acquaintance who then turned the gun on himself, deputies said.

But details about what exactly led to the attack — and any underlying tensions among the men — remained murky on Monday.

Perry Allen, 55, was the only victim to suffer multiple gunshot wounds to the torso, East Baton Rouge Parish Coroner Dr. William “Beau” Clark said. The slain man’s brothers, Joseph Allen, 57, and Mark Allen, 51, each died from one gunshot wound to the chest, Clark said. He confirmed the trio were all homicide victims.

The suspected shooter, Rodney Chemin, 60, died of a self-inflicted gunshot wound to the head, Clark said.

At some point during the night, the four got into an argument over music at the home of Dwayne Crumholt, in the 12000 block of Talmadge Crumholt Road, a private drive in a mostly rural area of Central, the East Baton Rouge Parish Sheriff’s Office reported Sunday.

Crumholt said Sunday that he was Chemin’s cousin and was close friends with all three Allen brothers, who were frequent guests at his home.

Earlier that night, people had gathered at Crumholt’s house to watch the LSU game and sing karaoke.

The argument over music at the get-together led to a fight on the front porch of Crumholt’s house, his family members said Sunday.

The autopsy, however, showed none of the men’s bodies had significant scratches or other obvious signs of struggle, Clark said. Alcohol and toxicology test results on the men will be ready in two weeks, he said.

Just after midnight, Chemin and the brothers left the party, though not at the same time, Casey Rayborn Hicks, a Sheriff’s Office spokeswoman, said on Monday.

About 10 minutes after they left, Crumholt said he heard gunshots and discovered the men lying in the driveway of Chemin’s house a few hundred yards away.

Deputies responded to the incident at 12:31 a.m. Sunday, Hicks said.

“They was friends,” Crumholt said of the relationship between Chemin and the Allen brothers. He declined to comment further.

Patricia Allen, a sister to the brothers, said Monday that she and her family are still puzzled by the motive behind the killings. She described the shooter as an acquaintance of her siblings.

“I have pity on his family, as well as mine. But mine suffered a lot more heartache,” she said.

Attempts to reach Chemin’s family members were unsuccessful Monday.

Hicks said she did not have information on the type of firearm used in the killing and could not immediately reveal whether there had been prior police calls to Crumholt’s or Chemin’s residences.

The investigation is still underway.

Advocate reporter Bryn Stole contributed to this report. Follow Maya Lau on Twitter, @mayalau.