The two men were teammates from 1984-89, and Rivera started at strong side linebacker during Duerson's final two years with the Bears -- 1988-89.
"That was a very sad situation," Rivera said at Lucas Oil Stadium. "It's the 25th anniversary [of the Bears Super Bowl XX victory], Richard Dent is getting into the Hall of Fame and this coming weekend we're going to celebrate the life of another one [of our teammates during Duerson's funeral]. It's a very sad situation. Sad for all of his former teammates, friends and family. It most certainly did hit home a little bit. He'll be greatly missed."