Vernon, Vermont - G. Gordon Liddy, the infamous Watergate operative who went to prison for his involvement in the affair, and later became a successful television actor and talk show host, has died at age 90.

Liddy died on Tuesday in Mount Vernon, Vermont, his son told CNN.

The cause of death is still unknown, but it's reportedly unrelated to Covid-19.

Liddy, who worked for President Richard Nixon's reelection committee, is infamously known for being the "mastermind" behind the break-in at Democratic National Committee headquarters in the Watergate office complex on the night of June 17, 1972.

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He notoriously said, "I certainly regret that the mission failed," and went to prison rather than testify.

He was arrested on charges of burglary, conspiracy, and wiretapping. He only served four and a half instead of 20 years after President Jimmy Carter commuted his sentence.

"I was the cut-out, so I took the hit. I was protecting my president and doing the best I could. It would have worked too, you know, if those other turkeys could have kept their mouths shut," Liddy said after his release.

When he left prison, Liddy became showman, hosting a radio program and making several guest appearances on TV shows.

"When I did Watergate, I probably had more fun doing that than I had doing anything else," he once said. "I do and act and live as most men only dream."