Garrett Reid, the eldest son of Eagles head coach Andy Reid, was found dead at training camp Sunday morning.
"Garrett grew up with this team, and it makes this news even harder to process," Eagles general manager Howie Roseman said. "We've been with Andy a long time. He's always been strong for us, we're going to be strong for him right now."
Lehigh University Chief of Police Edward Shupp said police responded to a 911 call at 7:20 a.m. regarding an unresponsive male. When they arrived on the scene, attempts to revive Garrett Reid had been made, but he was pronounced dead on the scene.
Shupp said there was no sign of suspicious activity, and the investigation has been turned over to the coroner's office.
Offensive coordinator Marty Mornhinweg and defensive coordinator Juan Castillo led the team in practice Sunday, based on Reid's request.
However, Eagles owner Jeffrey Lurie said he expects Reid to return to coach the team this week.
"He treasures these practices and he feels bad he's gonna not be at practice today, or probably tomorrow," Lurie said, according to NFL.com.
The Eagles play their first preseason game on Thursday at home against the Pittsburgh Steelers.
Joe Banner, the Eagles' former team president who recently joined the Cleveland Browns, released a statement, which read: "Words cannot express my sadness upon hearing the tragic news this morning. I've known Garrett since he was a teenager and saw him grow up amongst the Eagles family. It's hard to comprehend how heartbreaking it must feel to lose a child. My deepest condolences go out to Andy, Tammy and their entire family."