TOOELE — Two people from Texas were killed on I-80 in a collision early Monday morning.

Utah Highway Patrol Sgt. Donavan Lucas said the driver of a silver Mustang lost control of the car as he was headed eastbound on I-80 near the SR-201 junction and went off the right side of the road about 1 a.m., possibly rolling the vehicle.

The Mustang was then struck from behind by a Cadillac, killing the driver of the Mustang.

The impact with the Cadillac sent the Mustang into a spin, ejecting the female passenger. She was hit by a passing semi truck and died, Lucas said.

Neither of the Cadillac's two female occupants were injured, though the air bags deployed. The semi driver was also unharmed.

While it appears both people in the Mustang were wearing seat belts, the woman in the passenger seat may not have been wearing a shoulder strap, which allowed her to be ejected from the car, Lucas said.

The identities of the deceased were not released.

McKenzie Romero, Twitter: McKenzieRomero