Oregon Secretary of State Dennis Richardson (R) has died of brain cancer, his office said Wednesday morning. He was 69.

Richardson was just over two years into his term as Oregon’s top elections and administration official. He served six terms in the state legislature before leaving to run for governor in 2014, a race he lost narrowly to the incumbent Democrat.

He made a comeback in 2016, becoming one of the only Republicans to win statewide office in Oregon over the last several decades. He was diagnosed in May with glioblastoma, the same form of brain cancer that claimed the life of the late Sen. John McCain John Sidney McCainCindy McCain endorses Biden: He's only candidate 'who stands up for our values' Biden says Cindy McCain will endorse him Biden's six best bets in 2016 Trump states MORE (R-Ariz.).

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In a statement, deputy Secretary of State Leslie Cummings said Richardson died late Tuesday at his home, surrounded by family and friends. Cummings said Richardson lived by the motto "Pro Tanto Quid Retribuamus" — "having been given much, what will you give in return?"

“Dennis leaves a legacy of always aiming high, expecting excellence, moving fast, and doing what is right for the people. It has been an honor and a privilege to work with such an incredible leader and wonderful friend. He will be greatly missed,” Cummings said.

Richardson, who served as a combat helicopter pilot in the Vietnam War, is survived by his wife, Cathy Richardson, their nine children and 31 grandchildren.

Gov. Kate Brown (D), who held the office before Dennis Richardson, will appoint his successor.