I have been watching this man on tv for many years. I have always liked and respected him. I don't know what planet I have been on in the last three years, but, I just now, found out that he passed away in 2017 of brain cancer. This shocked me, to think that he was still with us. Ultimate Weapons and his other shows were well represented by his knowledge and access to what had to have been a dream career. Following a stellar service as Seal Sniper. 51 years old is still a young age. RIP.Mack!