The man who was fatally shot by FBI agents in a Bergen County home last year was the ringleader of a group who had kidnapped a teenager in Pennsylvania and demanded a $500,000 ransom, according to court documents. The dead man, whose name still has not been released, was killed June 16, 2021, by agents who stormed an apartment on Lakeview Avenue in Leonia, according to the criminal complaint, which was first reported Monday by NorthJersey.com. In court documents filed with the Eastern District of Pennsylvania, FBI agent James J. Zajac states that the 17-year-old kidnapping victim had failed to…