Days ago, we reported on the Uber driver who said that he killed six people and tried to kill two others in Michigan because a "devil figure" in the Uber app made him do it.

Then it appeared that 45-year-old defendant Jason Dalton was singing a different tune, instead blaming the murder spree on Uber management. At least that's what a federal lawsuit lodged under his name would have us believe. But on Thursday, Michigan authorities said the lawsuit—which touched on key complaints from Uber drivers who don't get overtime, sick pay, or health benefits—was a cruel hoax.

The suit, lodged in Michigan federal court, was handwritten, named Dalton as the plaintiff, and listed the Kalamazoo County Jail as the return address. But what tipped off the authorities was that the suit, mailed to the Eastern District Of Michigan court in Detroit, was postmarked in Philadelphia.

"That's what alerted us, the Philadelphia postmark," Kalamazoo County Undersheriff Pali Matyas told mlive.com early Thursday. "He said he didn't send it, didn't authorize it, doesn't know who did."

The bogus suit sought $10 million in punitive damages. The San Francisco ride-sharing service, the suit said, was the reason why Dalton was jailed awaiting trial in connection to the February 20 killing spree in the Kalamazoo area of Michigan.

"I am currently in prison because of Uber. Uber doesn't care about its drivers. We are peasants and pawn pieces to Uber's bottom line. Defendants manipulate Uber drivers. My life is ruined because of Uber. My wife is divorcing me because of Uber," Dalton said in the lawsuit. (PDF) "I worked years as an Uber contractor and they ripped me off, never paid me back wages or overtime. I busted my butt for them."

The bogus suit also complained that Dalton never got a "Christmas bonus" and "I wasn't invited to any corporate parties."

Investigators reported last week that the suspect told them he experienced a "full body takeover" from the Uber app during the shooting spree. Dalton is accused of six counts of murder and two counts of assault with intent to commit murder, in addition to related firearms charges. He faces a lifetime behind bars if convicted. He is accused of shooting eight people at three locations in a single evening.