G. Gordon Liddy, the Nixon 1972 reunion campaign operative who played a central role in the Watergate scandal that led to the resignation of the former president, died on Tuesday at the age of 90.

Liddy’s son, Thomas, confirmed his death. He Did not give cause of death, but noted that COVID-19 was not a factor.

A former FBI agent, Liddy was known as the mastermind of a plot to erect a wiretap inside the Democratic National Committee headquarters in the Watergate building in 1972. The plot was discovered and Liddy was later convicted on charges of conspiracy, theft and illegal wiretapping.

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