Arkady Kolcheck was the father of Anna Kolcheck, and an associate and informant of G. Callen.
Even though he and his daughter were never particularly close, he was proud of the woman she became. After Amelia's birth, Arkady was disappointed that he couldn't get to know his only grandchild. He supported Anna and Mel financially, figuring that was the only thing he could really do for them without causing more trouble.
Arkady died when Amelia was still a child.