Hacker.

Server: DayZ Livonia EU - DE 4313 (Persistence ON) IP: 195.82.158.113:11500
Time: Around 15:05 GMT +2
My steam profile: https://steamcommunity.com/profiles/76561198050327079

Incident: We enouctered a cheater. We were at our base, scrolling through our items and what we had just looted. Suddenly I lost 50% of my health and my character made a sound just like somebody had punched me. Then my friend made same sound and got killed. Maybe couple of seconds after that I got killed too.