Senator John McCain, a towering figure in American politics, has died at age 81 following a battle with brain cancer. As the country notes his passing with sadness and admiration, WGBH's Frontline looks back at McCain's life, politics and legacy, from his years as a POW in Vietnam, to his dramatic 2017 vote against the GOP's health care bill.

See it tonight at 9pm on WGBH 2.