(AP) — G. Gordon Liddy, a mastermind of the Watergate burglary and a radio talk show host after emerging from prison, has died at age 90. His son, Thomas Liddy, confirmed the death Tuesday but did not reveal the cause, other than to say it was not related to COVID-19. Liddy, a former FBI agent and Army veteran, was convicted of conspiracy, burglary and illegal wiretapping for his role in the Watergate burglary, which led to the resignation of President Richard Nixon. He spent four years and four months in prison, including more than 100 days in solitary confinement. After his release, Liddy became a popular, often provocative radio talk show host. He also worked as a security consultant, writer and actor.