Anti-gun activist killed man with 'close range' head shot at child's pool party as revenge for his own son's shooting death. https://www.msn.com/en-us/news/other/anti-gun-activist-killed-man-with-close-range-head-shot-at-child-s-pool-party-as-revenge-for-his-own-son-s-shooting-death/ar-AA28FuVZ