The accident occurred about 2:30 a.m. when a black BMW 740i struck a Toyota Prius, police said. The drivers of both cars were pronounced dead at the scene.
They were the only occupants of the vehicles.
The driver of the Prius security car was identified as Billy Gonzalez, 30, of Fort Worth an on duty security officer working for Securitas Security. The other driver's name had not been released.
Shortly before the accident, a witness called 911 and said a black car was headed the wrong way on I-30 at high speed near the Oakland Bouleveard exit.
Several minutes later, police received the report of the accident.
Traffic investigators determined that the BMW swerved into the Prius, striking it head-on.
The accident forced the closure of I-30 overnight but the lanes were reopened by rush hour Monday morning.