Prior to the apocalypse Dexter was a historical travel blogger, he had a keen interest in the history of Chernarus and it's historical sites. Unluckily for him he had chosen to go weeks before the chaos spread across the country.
These memories of course were long forgotten by Dexter.
Dexter could not recall what had happened, all he remembers is waking up in a shack in the woods with a bandage around his head. His memories were hazy apart from remembering a few details about himself, he had no clue what had happened in the prior years. The further he'd travelled back into what was left of society he did remember one thing. That society had gone downhill.
All Dexter could do now was move on each day scavenging for supplies and hoping that he could piece back together the remnants of his memories.