Seymour, New England's top draft choice in 2001 and a two-time Pro Bowl selection, had a strong bond with his father, who significantly influenced his son's athletic career. Growing up, Seymour spent summers working for his father, a mason contractor.
Though his parents separated when he was 6, they regularly attended Patriots home games.
In January, before the Patriots' second Super Bowl appearance in Seymour's three seasons, his father spoke of his role in Seymour's upbringing.
"I knew if anyone was going to teach him, it was going to be me," said Seymour Sr. "I was telling him, 'No matter what you do in life, you're going to have to work hard at it.' And his way out was football."
The New England Patriots released a statement last night that said, "We are deeply saddened to hear of the tragic news involving Richard Seymour's father. We extend our most heartfelt sympathies to Richard during this very difficult time. Our thoughts and prayers are with the Seymour family."