Matfey Nikolaev, and his twin sister Yekaterina were born in Kamensk. They were separated at the age of three and Matfey went to live with his father in America. In his teen years he started to write to his sister back in Kamensk, and they kept correspondence for a long time. Matfey joined the American military, and afterward bounced around between several PMC's. He'd always intended to return to Kamensk and reunite with his other half.
When the July 7th incident took place, Matfey lost all contact with his sister. Without knowing what happened to her, Matfey started to lose control. He began plotting to sneak back in to Chernarus. His father had assured him many times that it was a hopeless endeavor, but in the end saw that Matfey had no other choice. He could not live with the uncertainty. He had to find out what happened to his sister.
Matfey used connections he'd made during his time in the PMC's to get back into Chernarus by boat without attracting government attention. At that time the outbreak was just spilling over into the west and so little attention was paid. By the time he'd returned to Kamensk, it was little more than a series of cold craters. Matfey searched for survivors that might have known the fate of the inhabitants of the town, but to this day he still looks for his long lost sister.