Bernard Leon Baker was also known to be involved in a failed attempt to invade Cuba back in 1961.
It is reported by the AP news agency that he had heart problems and he had also been suffering from cancer.
The Watergate burglary triggered one of the most damaging scandals in American politics and ultimately led to the then President Nixon having to stand down.
The agent was often involved in controversy and some even named him as having played some part in the assassination of JFK.
The former CIA agent became known for being part of a group of five men who broke in to Watergate headquarters at the urging of President Nixon.
The group broke in as part of an attempt to lay wiretaps so they could so they could spy on a Democrat who was opposing Nixon. This eventually led to Nixon standing down two years later.
Bernard Baker was jailed for just over a year and remained unremorseful about his involvement in the break in.
He once stated that Nixon was among the best presidents the US had