NEW MEXICO (AP) –Police say they have arrested a man believed to have shot a woman in the head while she was driving him down the highway near Grants, in western New Mexico.

The pair, believed to be boyfriend and girlfriend, started arguing Wednesday while driving down Interstate 40 in a Ford Mustang, New Mexico State Police said.

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Deandre Mirabal 23, pulled out a gun during the argument as he sat in the passenger seat, and the woman, 21, tried to grab it as she drove.

“During the struggle for the firearm, it went off and struck the female in the head,” New Mexico State Police spokesman Dusty Francisco said in a statement Friday.

It’s unclear if the man meant to shoot the woman or just threaten her.

After the gun went off, the man grabbed the steering wheel from the passenger seat and “brought the vehicle to a safe stop and drove the vehicle to the Cibola General Hospital in Grants, NM,” Francisco said.

The woman was later flown to a larger hospital in Albuquerque where she later died.

Police said the man was arrested Thursday and charged with aggravated battery with a deadly weapon.