Erik Falk is a norwegian male, who used to be part of a 1% MC in the US, and later part of a bigger criminal organization who dealt in drugs and illegal arms. HE eventually got out of this life due to him and his allies getting hunted and killed by rival gangs.
After leaving the city and the US as a whole, he decided to travel around the world for a while, before settling down in the Bahamas with his ill-gotten gains. Intending to enjoy his retirement from crime in a tropical paradise.
But eventually he got restless and felt like he needed to something, and realized the retired life as a 26 year old wasn't for him. So he joined up with Doctors Without Borders as security and a logistics worker. Which led him to Chernarus shortly before the outbreak.
He doesn't know what happened to the camp he worked at, but can assume it was either attacked by raiders, the infected or both. As he was gone for a few days to get fuel for the camp, and when he returned it was destroyed and pillaged with no trace of anyone. He grabbed what he could gather and took off to search for other survivors, and here's where his DayZ story begins.