Robert Charles Browne, a 68-year old Louisiana native, who serves a double-life sentence at the Colorado Territorial Correctional Facility may just be one of the most prolific murderers in American history. However, some of the self-professed serial killer's uncorroborated claims leaves plenty of room for speculation about the cold cases that remain unsolved in the wake of his imprisonment...How many of Browne's purported kills are real? Considering his 140 IQ, is he lying to deflect some of his more atrocious crimes? Read about the most intelligent serial killers in recent memory.