WASHINGTON (AP) He was described as the evil genius of the Nixon administration, and spent the better part of a year in prison for a Watergate-related conviction. His proclamations following his release that he was a new man, redeemed by his religious faith, were met with more than skepticism by those angered at the abuses he had perpetrated as one of Nixons hatchet men.

But Charles Chuck Colson spent the next 35 years steadfast in his efforts to evangelize to a part of society scorned just as he was. And he became known perhaps just as much for his efforts to minister to prison inmates as for his infamy with Watergate.

Colson died Saturday at age 80. His death was confirmed by Jim Liske, chief executive of the Lansdowne, Va.-based Prison Fellowship Ministries that Colson founded. Liske said the preliminary cause of death was complications from brain surgery Colson had at the end of March. He underwent the surgery to remove a clot after becoming ill March 30 while speaking at a conference.

Colson once famously said hed walk over his grandmother to get the president elected to a second term. In 1972 The Washington Post called him one of the most powerful presidential aides, variously described as a troubleshooter and as a master of dirty tricks.