Dick Cheney, widely regarded as the most powerful vice president in U.S. history, who was George W. Bush’s running mate in two successful campaigns for the presidency and his most influential White House adviser in an era of terrorism, war and economic change, died Monday. He was 84.

The cause was complications of pneumonia and cardiac and vascular disease, according to a statement from his family.

Plagued by coronary problems nearly all his adult life, Cheney had five heart attacks from 1978 to 2010 and had worn a device to regulate his heartbeat since 2001. But his health issues did not seem to impair his performance as vice president. In 2012, three years after retiring, he underwent a successful heart transplant and had been reasonably active since then.

Most recently, he startled A

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