Robstown police have released the names of two Michigan men killed Wednesday after they were struck by a pickup truck while changing a tire.

Lt. Gilbert Gomez, with the Robstown Police Department, said the victims were identified as 64-year-old Russell Don Sullivan, of Vestaburg, Mich., and 68-year-old William Matthew Summers, of Midland, Mich. The families of both men have been contacted and informed of their deaths, Gomez said.

According to the police report, Sullivan and Summers had pulled over to the shoulder in the southbound lane of U.S. Highway 77 in order to change a tire on their recreational travel trailer. As the pair worked, a pickup truck driven by 57-year-old Peter Huerta, of Ingleside, struck the victims.

Both men were pronounced dead at the scene, Gomez said.

Officers determined that Huerta may have been intoxicated and placed him under arrest, Gomez said. A blood draw was performed on Huerta at the scene, he added, which is a state mandate after any traffic accident that results in a fatality.

There is no timetable on when results are expected back from the Texas Department of Public Safety's labs, Gomez said, but it could range anywhere from a few weeks to a couple of months.

Huerta is being held at the Nueces County Jail on suspicion of two counts of intoxication manslaughter, a second-degree felony. Gomez said Huerta is also being held without bail due to a parole violation.