Trackdown: Help find Celestino Cisneros' killer

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In this week’s Trackdown, Dallas homicide detectives need help finding a killer from four years ago.

The murder is old, but the images of the suspect are new. The video has never been released, until now, to FOX 4’s Shaun Rabb.

The video shows a man in a Pleasant Grove 7-Eleven accused of beating a man to death. The victim was panhandling at the convenience store’s gas pumps.

[REPORTER: "How do you solve a cold case?"]

"Video and witnesses,” said DPD homicide detective Frank Serra. “We didn’t have any witnesses who were willing to come forward at the time.”

Serra hopes the time is right for someone to come forward and identify the suspect.

It’s been four years since 58-year-old Celestino Cisneros was beaten to death at the 7-Eleven at Lake June and Jim Miller.

He was killed at 11:15 p.m. on May 13, 2015, one day after Mother's Day.

“The victim was approaching other patrons near the gas pumps. We know he kind of panhandled in the area, so we can assume that’s what he was doing. But we don’t know exactly what was said,” Serra said.

Video shows the suspect pull into the parking lot in what police believe is a late 90s model Oldsmobile.

He gets out of the car and goes inside the 7-Eleven.

The bearded suspect was wearing a plaid short-sleeve polo shirt and a backwards cap with writing on the front and back.

After leaving the store, he drove over to gas pump no. 2.

That’s when police say Cisneros approached the suspect, who started beating him.

“He was beaten so bad, he was in a coma for about five months before he finally passed away,” Serra said. “We ask, you know, come forward. Do the right thing. Tell us who he is, so we can get this family justice and closure.”

Adding to the family's suffering, Cisneros' mother died soon after he was pronounced dead.

Crime Stoppers has put up a reward.

Det. Serra needs the public’s help to catch a killer who was caught on tape, but who is still at-large.

You can call Serra at 214-671-4320.