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RICHARDSON (CBS 11 NEWS) – Police in Richardson have released the identities of the drivers involved in two crashes that left one person dead and backed up traffic on Highway 75 for hours Friday morning. There is also new dash cam video of the second crash.

Investigators said Eric Mack of Plano was killed as a result of the wreck. The 49-year-old lost control of his vehicle while traveling in the HOV lane. He was traveling northbound on the highway and crashed near the Midpark Road exit.

Shortly after the wreck, police believe several drivers stopped to help.

It was just a short time after the first accident that investigators think Jose Mendez, 40, smashed into the scene with his Chevy pickup. Police arrested Mendez for intoxicated driving.

“All I can remember is just the hard hit. And then after that, all I remember is just seeing the person on the floor,” said Victor Romero, a witness who recorded a portion of the wreck from his dash-camera. “I think if I was out there five seconds sooner, I probably would have been impacted as well.”

Police do not know if Mack died as a result of the initial wreck or from the second collision investigators believe was caused by Mendez.

Richardson police are waiting on information from the Dallas County Medical Examiner’s Office, where a complete autopsy is being performed. They said more charges could follow depending on the results.

“It hurts me and I have no idea who those people are. My prayers are definitely with them because I can’t understand what they’re feeling right now,” said Romero.

Two other people were hurt in the wreck and are still recovering.

Richardson police is still looking for any witnesses that could shed more light on what exactly happened.

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