According to Khloe Kardashian, the downward spiral of Rob Kardashian can be traced back to Lamar Odom.
In a clip from this Sunday's Keeping Up with the Kardashians, Khloe implies that her ex-husband's drug problems rubbed off on Rob while the three lived together.
Sources tell TMZ, meanwhile, that Lamar Odom has, indeed, played a role in Rob's ballooning weight gain and rumored hard drug use... but not for the reason Khloe believes.
Those connected with the family say Rob was more devastated than his siblings when his dad died in 2003.
He never really got over this passing, but Rob started to look at Odom as a father figure the closer he grew to his sister’s boyfriend and eventual husband.
Hanging around Odom inspired Rob to get in shape and even start his own sock business.
But then Odom fell apart, allegedly got into cocaine and other substances - and definitely cheated on his wife.
Once his relatives cut Lamar off, Rob fell into a tailspin, stuffed his face with food, inhaled some drugs of his own and turned into a Kardashian outcast.
He's sent out a few social media messages over the past couple weeks, giving folks hope that he can still turn his life around, but Rob still has a long way to go.