Former Vice President Dick Cheney battled heart disease for most of his adult life, having his first heart attack at 37.
He survived four more heart attacks before undergoing a heart transplant in 2012, which extended his life.
Cheney's health issues illustrate the accumulation of heart trouble and varied treatments, with heart disease being the nation's No. 1 killer.
Cheney died due to complications of pneumonia and cardiac and vascular disease.
Author's summary: Cheney's life was extended by a heart transplant after decades of heart disease.