Emergency services were called to the Olympic Highway about 2.30am on Sunday after a vehicle reportedly rolled and hit a tree.

A 22-year-old man died at the scene.

A second man, aged 31, was in a critical condition following the incident.

He was treated by paramedics for serious injuries and died while he was being transported to hospital.

Police said both of the men were ejected from the vehicle during the crash.

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The incident occurred about seven kilometres north of the Henty township, on a bend in the road, and led to the highway being closed for several hours and diversions being put in place.

Volunteers from the State Emergency Service at The Rock attended the scene along with police, paramedics and firefighters.

An SES spokesman said the crew had assisted the injured man before he died.

"Our thoughts are with their families and also with all members of the different emergency services who attend the scene," the spokesman said.

Debris was left at the scene.

Police had been working to notify family members on Sunday.

They said reports would be prepared for the coroner.

The incident occurred a short distance from a crash that claimed the life of a Lavington boy a week earlier.

The six-year-old boy died when the vehicle he was in crashed on Holbrook Road at Mangoplah, which is still being investigated.

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