MISSOULA, Mont. -

The Missoula County Sheriff's Department confirms that a 64-year-old Missoula man died tonight after his son called for help while fishing on the Clark Fork River.

Emergency crews were called out to a sand bar in the middle of the Clark Fork River near Milltown, just east of the railroad bridge.

Crews arrived on the scene around 4:40 p.m. where they found a man reportedly trying to save his father. The man performed CPR until paramedics arrived. Life Flight airlifted the victim to a Missoula hospital about an hour later.

Battalion Chief Greg Orr told NBC Montana that cold conditions and cold water made rescue attempts challenging, which is why they decided Life Flight was the best option to get the victim out.

The man's identity has not been released at this time.