The chain of events began when Broadwater County Deputy Mason Moore was pursuing a vehicle and told dispatchers he was stopping it at about 3 a.m. but did not respond to further communication, the sheriff's office said.
The SUV was spotted again near Anaconda. Officers deployed spike strips, but the vehicle continued another 30 miles (48 kilometers) on Interstate 90.
The suspects took off from the scene then later were pursued by other law enforcement officers.
Two suspects, 61-year-old Lloyd Barrus and 39-year-old Marshall Barrus, have been arrested and charged with deliberate homicide.
They are Marshall Barrus, 38, of Gallatin County, and Lloyd Barrus, 62, whose last known address is Bakersfield, California. Gallatin County Sheriff's Office, Park County Sheriff's Office, Lewis and Clark Sheriff's Office, Broadwater County Sheriff's Office and Montana Highway Patrol all have responded to the incident.
Officers from numerous jurisdictions joined a procession at mid-day Tuesday to escort Moore's body from Three Forks to Billings for an autopsy.
A Montana sheriff's deputy who was killed during a traffic stop early Tuesday died less than two miles away from where a state Highway Patrol trooper was shot and killed in 2010.
According to the state's Public Safety Officer Standards and Training office, Moore had previously worked for the Department of Transportation's Motor Carrier Services from 2012 to 2015 before joining the Broadwater sheriff's office. He was a husband and father of three children.
The shooting touched off a search that resulted in a pre-dawn chase covering more than 140 miles in southwestern Montana and ending in a shoot-out that sent one suspect to the hospital and his father to jail.
The name of the Broadwater County deputy has not been released. "During this week of remembrance, please do me a favor and smile and wave when you see a peace officer - we could use it!"
Butte-Silver Bow County Sheriff Ed Lester says the suspects fired shots at officers who pursued the vehicle across parts of five counties.
Gallatin County Sheriff Brian Gootkin says a Broadwater County sheriff's deputy was killed near Three Forks. He was taken to the hospital where his condition was not available. The passenger has not be identified.
Stevens says it's a brotherhood and sisterhood among deputies, and cascade county officials know Broadwater would provide equally as much support. He is believed to be the shooter's father. The suspects in the Suburban then began firing at the pursuing officers with at least one semi-automatic rifle.