COLUMBIA, S.C. (AP) — The gunman who killed five people including a prominent doctor in South Carolina was former NFL player Phillip Adams, who killed himself early Thursday, authorities confirmed Thursday.

Dr. Robert Lesslie, 70, and his wife, Barbara Lesslie, 69, were pronounced dead at the scene along with grandchildren Adah Lesslie, 9, and Noah Lesslie, 5, the York County coroner’s office said.

A man who had been working at the home, James Lewis, 38, from Gaston, was found shot to death outside, and a sixth person was hospitalized with “serious gunshot wounds,” York County Sheriff’s Office’s spokesperson Trent Faris said.

Authorities said at a news conference that they had not yet determined a motive.

“There's nothing right now that makes sense to any of us," said York County Sheriff Kevin Tolson.

A source familiar with the investigation said Adams had been treated by the doctor. The source said Adams killed himself after midnight with a .45-caliber weapon.

Tolson said evidence left at the scene of the shooting led them to Adams as a suspect. He said they went to Adams' parents' home, evacuated them and then tried to talk Adams out of the house. Eventually, they found him dead of a single gunshot wound to the head in a bedroom, he said.

Adams, 33, played in 78 NFL games over five seasons, from 2010-15, for six teams. A safety and special teams player from South Carolina State, he joined the 49ers in 2010 as a seventh-round draft pick.

Rarely a starter, Adams also was with New England, Seattle, Oakland and the New York Jets, finishing his career with the Atlanta Falcons in 2015.

As a rookie late in the 2010 season, Adams suffered a severe ankle injury that required surgery that included several screws being inserted into the leg. He never played for the 49ers again, getting released just before the 2011 season began and signing with New England. He moved next to the Raiders, where he had 2 concussions in a 3 game period in 2012.

Whether Adams suffered long-lasting injuries from his concussions as a player wasn’t immediately clear. Adams would not have been eligible for testing as part of a broad settlement between the league and its former players over such injuries, because he hadn’t retired by 2014.

Adams’ father told a Charlotte television station that he blamed football for problems that may have led his son to commit Wednesday’s violence.

“I can say he’s a good kid,” Alonzo Adams told WCNC-TV. “I think the football messed him up.”

Faris said early Thursday that deputies were called around 4:45 p.m. Wednesday to the Lesslies' home, and spent hours searching for the suspect before finding him in a nearby home.

“We have found the person we believe is responsible and we are with him at this time and that’s all I can say about the suspect,” Faris said, adding that they had no reason to believe anyone else was involved. “We are currently at his house and we are serving a search warrant.”

Later Thursday, a few sheriff’s deputies were posted near the Lesslie home, which is far beyond an arched stone gate, up a long paved driveway and not visible from the road. The Adams home, roughly a mile down the road, is a modest, one-story brick house with several cars in the driveway.

Lesslie had worked for decades as an emergency room doctor in Rock Hill, board-certified in both emergency medicine and occupational medicine and serving as emergency department medical director for nearly 15 years at Rock Hill General Hospital, according to his website.

He founded two urgent care centers in the area and wrote a weekly medical column for The Charlotte Observer. He also wrote a book, “Angels in the ER,” collecting what he termed “inspiring true stories” from his time in the emergency department.

“I know without a doubt that life is fragile,” Lesslie wrote, according to an excerpt. “I have come to understand that humility may be the greatest virtue. And I am convinced we need to take the time to say the things we deeply feel to the people we deeply care about.”

Faris said Lesslie was very well known in the Rock Hill community.

“Dr. Lesslie was my doctor growing up,” Faris said. “Dr. Lesslie has been one of those people that everybody knows. He started Riverview Medical Center in Rock Hill and it’s been a staple in Rock Hill for years.”

A biography page said he and his wife raised four children, and that Lesslie received his degree at the Medical University of South Carolina.

President Joe Biden mentioned the mass shooting in South Carolina during a speech Thursday about gun violence.

"We saw it again last night," he said. "As I was coming to the Oval Office, I got the word that in South Carolina a physician with his wife, two grandchildren and a person working at his house was gunned down. All five."

Rock Hill is a city in northernmost South Carolina about 25 miles southwest of Charlotte, North Carolina.