https://sports.yahoo.com/longtime-nfl-coach-tony-sparano-dead-56-174306418.html?hl=1&noRedirect=1

Tony Sparano, an NFL coach for nearly two decades, has died at age 56.

Twice a head coach with the Dolphins and Raiders, Sparano had been on the NFL sidelines for 18 years and was expected to enter another season as an assistant with the Minnesota Vikings when training camp began on Tuesday.

Looks like a heart attack.