Knapp served as Peyton Manning's QBs coach from 2013-15 after Adam Gase was promoted to offensive coordinator, and presided over the MVP's record-setting 2013 performance. Manning threw for 5,477 yards and 55 touchdowns in Knapp's first year coaching him, which are still NFL records.
Broncos Country echoes the team, which released a "heartbroken" statement when the news of Knapp's death hit the wire.
"In his four years as our quarterbacks coach, Greg was an instrumental part of two Super Bowl appearances and our championship run in 2015. The job he did coaching quarterbacks during our Super Bowl 50 season was masterful. He navigated a unique situation with poise and instincts, keeping us on track with his even-keeled demeanor, exceptional teaching ability and caring nature.