Larry Flynt is a guest on "Piers Morgan Tonight" this evening, and he talks about his lifelong First Amendment crusade. "If you start compromising the First Amendment, you're on a slippery slope," he said.

Piers Morgan brought up the situation recently of the American pastor burning the Quran, and Flynt grouped him with those in the Westboro Baptist Church who boycott military funerals and more. "Those are bizarre incidents," said Flynt. " But we can't set aside one of the most important things that the framers gave us, ­free speech, ­ for the purpose of dealing with these idiots." Watch the full interview, including a conversation about the sex lives of presidents and morality in general (read more about it here), tonight at 9pmET/PT.

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Filmmaker and Oceanographer Michael DeGruy spoke with Piers Morgan last night about the situation underwater in the Gulf of Mexico one year after the Deepwater Horizon oil rig exploded. DeGruy says the coral near the well head is stressed and dying. He doesn't think the damage is done.

"You can't help but wonder is this really OK? Did we dodge a bullet? I don't think so ... I suspect that over time we will find issues," he said. FULL POST

Stacey Lannert was just 18 when she shot and killed her father. She was sentenced to life in prison without the possibility of parole, but was given a commutation in 2009. Part of that reason was the long history of sexual abuse by her father. She now has written a book, "Redemption," telling her story of survival, and her interview with Piers Morgan airs tonight.

"He didn't actually rape me until I was nine. That's the first time it happened," she says. "My father was an alcoholic and he would try to quit drinking and during those attempts our life was more peaceful, less violent." Hear her describe the moment she shot her father and her time in jail as well, tonight 9pmET/PT. Also airing tonight – Piers' sit-down with Larry Flynt.

One year ago today, The Deepwater Horizon oil rig exploded in the Gulf of Mexico. Last night, Piers Morgan spoke with Shelley Anderson, a Deepwater Horizon widow, Kenneth Feinberg, the man in charge of the BP compensation fund, and others in an effort to shed some light on the progress being made in the Gulf.

Anderson is trying to get some answers out of Transocean, the company that owns the rig. "Transocean has filed a lawsuit against me and my children," Anderson said. "These lawyers [they've assigned] in New Orleans don't know me... They don't have my best interest at heart." FULL POST

Each day, we here at "Piers Morgan Tonight" put together the news you need to know – from what happened last night to what will happen today.

For April 20, 2011 – Texas fires rage, airlines told to stop hiding fees, Midwest and South still threatened by storms... FULL POST