From AP:

Former NFL linebacker Junior Seau was found dead in his Oceanside, Calif. home, according to a report from TMZ.com.

TMZ reports that police are investigating a shooting.

A 12-time Pro Bowler, Seau played for three teams over a 20-year NFL career. He was drafted by the Chargers with the fifth overall pick in the 1990 NFL Draft, and spent the first 13 years of his career with San Diego. He totaled 47 sacks and 1,381 tackles with the team.

Seau was traded from San Diego to the Dolphins in 2003. He played for Miami for three seasons before being released. Seau announced his retirement the subsequent offseason, but wound up returning the next year to play for New England. He played for the Patriots for four years before retiring.
Seau finished his career with 56.5 sacks and 1,849 tackles. He played for two AFC champions -- the Chargers in 1994 and the Patriots in 2007 -- and was named an All-Pro 10 times. Seau was also named a member of the NFL's All-Decade Team for the 1990s, and was inducted into the Chargers' Hall of Fame in 2011.

On Oct. 18, 2010, Seau drove his car off a cliff in California shortly after he was arrested on a charge of felony spousal assault. Seau told police he fell asleep at the wheel.