BILLINGS, Mont. -- A firefighter died after suffering a cardiac emergency while battling a wildfire in southwest Montana. The firefighter was conducting suppression work on the ground, and a paramedic gave him medical aid, authorities said. However, attempts to resuscitate him failed, and he died Sunday afternoon.

A firefighter has died while battling one of multiple major wildfires burning in the West, authorities said on Monday. The firefighter died on Sunday afternoon when he suffered a cardiac emergency while helping to fight the Bivens Creek Fire in southwest Montana,

Parts of California, Oregon and Washington state will experience extreme heat at least through Tuesday, forecasters said.

Dangerously hot conditions hit states up and down the West Coast over the weekend, owing to a persistent heat wave stretching from the Pacific Northwest to California and the desert Southwest.

What do you do when the sun won’t leave you alone day and night? More than 50 million people in the Western United States are under heat advisories this weekend, with temperatures soaring into the triple digits from Washington to Arizona.