More information has surfaced regarding the circumstances that led to the death of 30-year-old Andy Richardson, who was pronounced brain dead on Tuesday after being hit in the head during a KORN concert in Atlanta.

Rhonda Cook of The Atlanta Journal-Constitution reports that Richardson's friends, who had worked with him as a roofer and were with him at the Sunday night concert, waited at home for the news.

"We just went out there to have a good night," said one friend, Eddie Arellano. "It was starting off fun. And then this whole thing turned into a nightmare."

According to Arellano and others at the concert, there was a group of rowdy men at the show.

"These guys were just way too drunk. They had too many fights," Arellano said.

Earlier in the evening, some of the rowdies tumbled down a hill, crashing into Richardson and his friends. There was a brief scuffle, according to Bernice Averil, who was in Richardson's group. A little later, the rowdies returned and one of them snatched Richardson's cap.

"When they took his hat he stood up and said 'We've already had a fight. I don't want to have any problems.'" Arellano said, describing the moments just before the punch. "The guy threw the hat back at him. And when he [Richardson] caught it, the guy hit him in the face and he [Richardson] hit the ground and hit the concrete with the back of his head. He just collapsed.

"His face was bloody. It was bad. It was horrible," said Arellano, who also was Richardson's roommate. The person who threw the punch and that person's friend ran off, Arellano said.

Atlanta police spokesman Officer Steve Coleman said homicide detectives "have people of interest" but no arrests had been made. Police have a "vague description" of the person who threw the punch, according to Sgt. Kevin Iosty.

Read more at The Atlanta Journal-Constitution.