A serving police officer has become the first Queenslander to die on the state's roads during the Easter holiday period.

Constable Casey Blain was killed while on duty near Georgetown in the state's far north on Friday morning.

Constable Casey Blain, killed on his first day of relief duty at Georgetown, in far north Queensland.

Investigations suggest the 29-year-old's car crashed on the Gulf Development Road at Routh Creek around 10:45am. He was the sole occupant.

“Constable Blain was working today, out on patrol and not home spending Easter with his wife and young child,” Police Commissioner Ian Stewart said.