Seau was voted to a Chargers-record 12 straight Pro Bowls and was an All-Pro six times.
"We all lost a friend today," Chargers President Dean Spanos said in a statement. "This is just such a tragic loss. One of the worst things I could ever imagine."
Seau's greatest game may have been in the 17-13 victory at Pittsburgh in the AFC championship game in January 1995 that sent the Chargers to the Super Bowl. Playing through the pain of a pinched nerve in his neck, he spread out his 16 tackles from the first play to the second-to-last. San Diego was routed 49-26 in the Super Bowl by San Francisco.
Humphries also recalled Seau recovering Elway's fumble to seal a come-from-behind victory in the 1994 opener at Denver.
Seau left the Chargers after the 2002 season when the team unceremoniously told him he was free to pursue a trade. He held a farewell news conference at the restaurant he owned in Mission Valley, and later was traded to Miami.
Seau retired a few times, the first in August 2006, when he said, "I'm not retiring. I am graduating."
Four days later, he signed with the New England Patriots. He was with the Patriots when they lost to the New York Giants in the Super Bowl following the 2007 season, which ended New England's quest for a perfect season.
Last fall, finally retired for good, Seau was inducted into the San Diego Chargers Hall of Fame.
His last season was 2009.
"Twenty years, to be part of this kind of fraternity, to be able to go out and play the game that you love, and all the lessons and the friends and acquaintances which you meet along the way, you can't be in a better arena," Seau said in August.
The Patriots issued a statement expressing grief over Seau's death. "This is a sad day for the entire Patriots organization, our coaches and his many Patriots teammates," the statement said.
More than 100 people gathered outside of Seau's home, only hours after he was found dead. Families showed up with flowers and fans wearing Chargers jerseys waited to get news.
Several hours after Seau was found, his body was loaded onto a medical examiner's van and taken away as fans snapped pictures and raised their hands in the air as if in prayer.
Family friend Priscilla Sanga said about 50 friends and family members gathered in the garage where Seau's body lay on a gurney and they had the opportunity to say goodbye.
"Everybody got to see Junior before they took him away," Sanga said. "He looked so peaceful and cold. It was disbelief. We all touched him and kissed him."
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