A man with all that privilege, turned into an assassin... and why he did it. TMZ exclusively speaks to several sources who say, despite his charismatic personality, Mangione also displayed a dark side and uncovers shocking new details about how he became enraged by corporate greed before quietly plotting to kill a healthcare CEO.

TMZ investigates Justin Bieber's troubling behavior that has fans concerned. TMZ explores allegations of Bieber's drug use, his marriage, financial collapse, as well as his ties to a controversial church. Additionally, TMZ Investigates: What Happened to Justin Bieber? examines a power struggle fueled by money, loyalty, religion and accusations of betrayal that are the center of a feud between Bieber and the person responsible for his meteoric rise - his former manager Scooter Braun. After a months-long investigation speaking with countless sources directly involved in his life.