Richard “Mack” Machowicz described himself as a “difficult, intense personality.” That’s why the former Navy SEAL wound up becoming a Zen Buddhist. The goal, he said, was to learn to “access a part of myself, to care about [others], that I never was able to before.”

Machowicz, the host of Discovery Channel’s “Future Weapons,” died January 2, 2017, of stage IV glioblastoma, according to his friend and SEAL teammate Craig Sawyer, who first shared news of Machowicz’s illness in an Oct. 5, 2015, Facebook post.