Paul Langmack played 311 NSWRL first-grade matches, including 174 for Canterbury between 1982 and 1990, when he won three premierships.
He later made 137 appearances for Western Suburbs, represented the NSW Blues four times in State of Origin and toured with the Kangaroos without playing a Test.
NRL executive chairman Peter V'landys paid tribute on Thursday morning. "You always knew Langers was in the room. He was incredibly funny, hugely popular and passionate," V'landys said.
Langmack died suddenly at 61, with reports saying he suffered a heart attack.
The Bulldogs confirmed his death on Wednesday morning in a statement featuring words from Phil Gould, his friend and former teammate.
"I am devastated to learn of Paul's sudden passing this morning," Gould said.
"Paul would contact me every day of the week about something to do with rugby league, I'm going to miss those calls and messages."
"Paul worked with the NSWRL for many years supporting the game. In recent times he volunteered his time to so many Bulldogs community initiatives."
Gould called Langmack a larger-than-life, energetic and enthusiastic character who was loyal to teammates and former coaches.
"He loved his rugby league. He was so loyal to his many teammates and ex coaches over the years. He loved them all," he said.
"He was always thinking of other people, this is a significant loss to so many… a true Bulldog."