WASHINGTON (AP) — Dick Cheney, the hard-charging conservative who became one of the most powerful and polarizing vice presidents in U.S. history and a leading advocate for the invasion of Iraq, has died at age 84.

Cheney died Monday night due to complications of pneumonia and cardiac and vascular disease, according to a statement from his family.

“For decades, Dick Cheney served our nation, including as White House Chief of Staff, Wyoming’s Congressman, Secretary of Defense, and Vice President of the United States,” the statement said. 'Dick Cheney was a great and good man who taught his children and grandchildren to love our country, and to live lives of courage, honor, love, kindness, and fly fishing. We are grateful beyond measure for all Dick Cheney did for our country. And we are blessed beyond measure to have loved and been loved by this noble giant of a man.'

The quietly forceful Cheney served father and son presidents, leading the armed forces as defense chief during the Persian Gulf War under President George H.W. Bush before returning to public life as vice president under Bush’s son, George W. Bush.

Cheney was effectively the chief operating officer of George W. Bush’s presidency, having a hand in implementing key decisions and was known for his significant influence on issues such as the war in Iraq. Despite facing health challenges, including surviving five heart attacks and receiving a heart transplant, he remained a formidable force in U.S. politics.

Years after leaving office, Cheney became a target of former President Donald Trump as his daughter, Liz Cheney, emerged as a prominent critic of Trump's actions during his presidency.

Amid his controversial legacy, Cheney claimed, 'In our nation’s 246-year history, there has never been an individual who was a greater threat to our republic than Donald Trump.' This statement highlighted the complexity of his legacy in a rapidly changing political landscape.

Cheney is survived by his wife, Lynne, and their two daughters, Liz and Mary. A defining figure for many in U.S. conservatism, his passing marks the end of an era in American political life.