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Casey Anthony is seen before the start of court on the day of closing arguments in her murder trial at the Orange County Courthouse in Orlando, Florida, Jul. 3, 2011. Reuters

True crime television network Investigation Discovery aired the first portion of its three-part Casey Anthony documentary Sunday night, and social media users were not pleased. "Casey Anthony: An American Murder Mystery" was skewered on Twitter by angry users.

“Some cases just capture the nation’s attention and this case was a firestorm — the panicked search for a missing toddler, a frantic family, police sent to chase suspects who may or may not exist, media demanding answers and devastated grandparents caught between their daughter’s lies and their desperation to find their granddaughter alive,” said Henry Schleiff, group president of Investigation Discovery, American Heroes Channel and Destination America. “Sex, betrayal and deceit are at the heart of this series, which will make viewers feel as if they are in the room for the bombshell prosecution of Casey Anthony as she was tried in both the court of law and, ultimately, the court of public opinion.”

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Anthony was tried and acquitted of aggravated manslaughter, aggravated child abuse and first-degree murder in 2011 for the death of her 2-year-old daughter, Caylee Anthony. Since dubbed "the most hated mom in America,” people close to her and the case, including the judge who presided over it, have said Anthony likely killed her daughter.

“There was a possibility that she may have utilized [chloroform] to keep the baby quiet ... and just used too much of it, and the baby died," Judge Belvin Perry Jr. said.

After the documentary aired Sunday, #CaseyAnthony began trending on Twitter, skewered by users who found the existence of the documentary absurd. Some of the more popular tweets voiced contempt for the fact that the notorious mother was still alive.

"When I see #CaseyAnthony trending and it's not cause she's dead" one user wrote, alongside a gif.

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Others expressed sorrow that Anthony was trending instead of her daughter.

"This beautiful angel should be trending instead. RIP Caylee Anthony" another user wrote alongside a picture of the 2-year-old.

Other's went for straight-up mockery.

"The only mystery surrounding #CaseyAnthony is how Florida found 12 people to vote "Not Guilty," one tweet read.

"#CaseyAnthony case a mystery? Also on DiscoveryID: Jeffery Dahmer: Misunderstood Romantic," said another.

Despite the Twitter firestorm, Anthony has made it clear she has little concern for what others think of her.

"I don't give a shit what anyone thinks about me. I never will," Anthony told the Associated Press. "I'm okay with myself. I sleep pretty good at night."