NSTS Episode 246 - Did Colonel Tom Parker Kill Elvis?

The legend of Elvis Presley is tremendous, but his entire story arc is tragic. Towards the end of his career, the poor kid from Tupelo, Mississippi who became the King of Rock and Roll was lonely, exhausted, and depressed, eventually succumbing to the pressures of his own fame. 

Is it conceivable to think that his manager, Colonel Tom Parker, a man with a dark history who lied about his real identity until the very end, was responsible for the death of Elvis Presley?