Mike Sager's excellent May 2009 Esquire article "Todd Marinovich: The Man Who Never Was" and the recent ESPN documentary "The Marinovich Project" both tell the compelling story of former USC and Raider quarterback Todd Marinovich's legendary fall from grace.
Marinovich was already smoking marijuana daily in high school when he was dubbed "Robo QB" because of his less-than-normal upbringing with father Marv. After arriving on USC's campus in 1988, he was introduced to cocaine during his redshirt season and then played two star-crossed seasons highlighted by a Rose Bowl victory over Michigan on New Year's Day 1990 and a dramatic win over UCLA the following season.
But Marinovich was arrested for possession of cocaine after the end of his redshirt sophomore season, and subsequently left for the NFL Draft after playing just two years for the Trojans, eventually being taken by Al Davis and the Los Angeles Raiders with the 24th pick.
Once in the NFL, Marinovich's erratic behavior and drug use didn't slow down. He admitted to using marijuana, cocaine, ecstasy, pharmaceutical amphetamines, and Vicodin, and by 1993, he failed three drug tests, ending his NFL career.
After his forced retirement, Marinovich racked up 10 arrests for investigation of cultivation of marijuana and possession of narcotics (source), sexual assault (source), suspicion of heroin possession (source), skateboarding in a prohibited zone & possession of meth and syringes (source), a probation violation (possession of drug paraphernalia) (source), possession of a controlled substance, unauthorized possession of a hypodermic needle & resisting a police officer (source), and another probation violation.
Marinovich's post-retirement, drug-addled years weren't without their football highlights, though. He made comebacks with both the CFL's BC Lions and the Arena League's Los Angeles Avengers, once throwing for ten touchdown passes for the Avengers while going through severe heroin withdrawal and soiling his drawers at halftime.
It doesn't get much lower than crapping your pants during a football game, does it?
Allegedly clean after years of abusing his once seemingly robotic body, Marinovich is putting his work in USC's Fine Arts Department to good use, painting in his Southern California studio and selling his work online.