G. Gordon Liddy, a former FBI agent who helped orchestrate the 1972 Watergate break-in, a crime that began the unraveling of Richard Nixon’s presidency, died on Tuesday at the age of 90. Liddy, who leveraged his Watergate fame into a 20-year career as a conservative talk-radio host, died surrounded by family at the home of his daughter in Mount Vernon, Virginia, his son, Thomas P. Liddy, told Reuters by telephone. “He had a full life, and it just had run its course,” the younger Liddy said of his father, adding that COVID-19 was not a factor. “He did all the good Lord asked of him and then a little more.” Liddy had been diagnosed a few years ago as suffering from Parkinson’s disease, his son said. News of Liddy’s death was first reported by the Washington Post. Liddy, born George Gordon Battle Liddy, was assigned to plug leaks to the …