Updated

By Marty Graham

OCEANSIDE, California (Reuters) - Former San Diego Chargers linebacker Junior Seau, considered one of the best National Football League defensive players of his generation, was found dead at his home in Southern California on Wednesday from a gunshot wound to the chest in an apparent suicide, police said. He was 43.

A young woman who identified herself as Seau's girlfriend alerted police to the death, saying she had found him wounded and unconscious in his beachfront home just north of San Diego, Oceanside police chief Frank McCoy told reporters.

Seau, a 12-time Pro Bowl selection whose last NFL season was in 2009, played most of his 20-season career with the Chargers before moving to the Miami Dolphins and the New England Patriots.

Seau's mother, Luisa, was weeping as she spoke before television cameras outside her son's house, where family and friends gathered as police continued to work at the scene.

"I pray to God please take me, leave my son," she said. "But it's too late."

Seau was inducted last year into the San Diego Chargers Hall of Fame, and was expected to be considered for the NFL Hall of Fame. He will become eligible for induction in 2015.

His death was being investigated as a suicide, police said. Seau did not have a documented history of concussions. He suffered a broken arm in 2006 that caused him to miss games, and before that sat out some contests with injuries to a chest muscle and Achilles tendon.

He was found in the bedroom at his home, and investigators recovered no suicide note, Oceanside police spokesman Lieutenant Leonard Mata said. The weapon Seau apparently used to kill himself was a revolver, Mata said.

In 2010, hours after his arrest on suspicion of domestic violence, Seau drove his car off a cliff. He said he fell asleep at the wheel, and prosecutors later declined to file charges in the domestic violence complaint.

His death came less than a month after former Atlanta Falcons safety Ray Easterling shot himself to death at age 62. Easterling had been diagnosed with dementia.

PLAYER SAFETY

Duerson's family filed a wrongful death suit against the NFL, arguing that a series of concussions he suffered during his NFL playing career damaged his brain. Duerson, who also shot himself in the chest, had told friends he wanted his brain examined after his death.

Luisa Seau followed the van down the driveway with her arms outstretched, crying and wailing, and was held back by several people. On the dashboard of the coroner's vehicle was a Chargers placard.

"Everyone at the San Diego Chargers is in complete shock and disbelief right now," the team said in a statement released on its Facebook page. "We ask everyone to stop what they're doing and send their prayers to Junior and his family."

Seau was born with the given name Tiaina Baul Seau Jr. in San Diego. When not playing football, he enjoyed surfing. In the garage of his two-story, brick and stucco Oceanside home were several surfboards neatly racked against a back wall, near a silver Mercedes-Benz.

He was the eighth player from the 1994 Chargers, who played and lost in the Super Bowl that season, to die before age 45, the team said. Among those players, running back Rodney Culver went down in a 1996 plane crash and linebacker Doug Miller was struck by lightning in 1998.

Seau's former wife, Gina DeBoer Seau, posted a one-word message on her Facebook page on Wednesday that said "lost." She had three children, two teenagers and an 11-year-old, with Seau.

Fans left bouquets of flowers and cards on a low brick wall outside the house, and the NFL expressed condolences.

"It is incredibly tragic and sad," NFL spokesman Greg Aiello said in a statement. "Our prayers are with Junior's family."

Seau was a fixture in San Diego's social and philanthropic circles. He opened a restaurant in town, and had a charity called the Junior Seau Foundation that was dedicated to helping young people avoid child abuse, drugs and alcohol.

Fagatua Tili, a pastor and the chaplain for Oceanside police, knew Seau from when the athlete was a school boy. Like Seau, Tili is of Samoan descent.

"Junior was a good man. He was a good boy and very kind. The talented gift he had he used well," Tili said. "I wish he asked for help. I wish we knew he was troubled."

(Additional reporting by Larry Fine in New York, Steve Ginsburg in Washington and Mike Blake in Oceanside, California; Writing by Alex Dobuzinskis; Editing by Cynthia Johnston and Will Dunham)