A popular former SEAL and television host Richard "Mack" Machowicz passed away Jan. 2 after a two-year battle with brain cancer. He was in his early 50s.
He was reportedly moved to hospice care in late December before friend and fellow SEAL Craig "Sawman" Sawyer posted the news on his Facebook page that Machowicz had died.
In one episode, Machowicz runs a team of former SEALs against a team of private security contractors and former Russian SPETSNAZ commandos through a series of intense challenges.
His media credits include 30 episodes of "Future Weapons," 10 episodes of "Deadliest Warrior" on the Spike network and six episodes of "Ultimate Soldier." Machowicz also published a motivational book "Unleash the Warrior Within" in 2002.