FORT WORTH (CBSDFW.COM)  Fort Worth police are trying to unravel a mystery that left two people dead.

Why would someone pull alongside a car loaded with people and shoot at it nearly a dozen times?

That’s what happened near Sycamore School road and I-35W Sunday night.

A witness said he saw the car with five people inside surrounded by a group of six to eight people in the parking lot of a restaurant minutes before the shooting.  He said apparently someone had left without paying their tab.  But that witness, who wanted to remain anonymous, said he couldn’t tell if there was a confrontation.

What police do know is someone pulled along side the white Toyota sedan and fired at least 11 shots as they drove down an I-35W frontage road.

21-year-old Fabian Guerrero and 22-year-old Diane Guerra both died from gunshot wounds.

Guerra’s aunt, Connie Saldana, recalled getting news of her niece’s death.  “He called me and was like, ‘They killed Diane! They killed Diane!’ I couldn’t believe it. I was hoping he was wrong.”

“He’s gone,” Guerrero’s mother sobbed as she looked at pictures of her son with Guerra. “They’re both gone. They’d been together for two years.  They loved each other. They’re both gone now.”

Two people in the back seat suffered non-life threatening wounds.  A third escaped injury.

Family members say the group had gone to a Dallas car show, eaten at a Hooters restaurant on Bryant Irvin and were on their way home.

No one’s sure what the motive for the shooting was.

Guerra’s aunt wonders if something happened at the car show.

“She posted on Facebook that she was glad they were leaving,” Saldana said. “I don’t know what happened. If they got in an argument or whatever, I guess they worked it out and they went to have dinner.”

Guerrero and Guerra lived in a garage apartment behind his mother’s house.

He had recently landed a new job to help pay for the care of a baby he had with his ex-girlfriend.

“He looks so much like him,” Perez said of the baby.  “They look so much alike, the baby and his dimples.”

The families now desperately want to find the killer or killers.

“She was a great loss,” Saldana said tearfully.  “We loved her.”

“I just want them to find who did this,” Perez said. “I just want justice done! I never thought this would happen to me. I’ve always told my kids I wanted to die before everyone.  And instead his ex-girlfriend comes to the door and tells me they both died!”

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