A man was killed in what appeared to be a car accident, but investigators said it was much more than just a crash.

It is a case the Houston Police Department wants to prevent from going cold, and they asked for the public's help Thursday night tracking down a killer.

Officials said 28-year-old Keisy Marquez did not die from the crash, but from a bullet.

Marquez's family said it was just by the grace of God that his two step-sons, who were in the car with him, were not killed too.

"He told me he loved me and he kissed me before he left, but I never thought that would be the last time that I would hear him say that to me," the victim's wife, Cecelia Marquez, said.

That day was Friday, Aug. 20.

Cecilia got a call saying her husband, Keisy, and her two sons had been in a serious accident.

"When I got there, my sons were in the ambulance," she recalled.

Keisy had lost control of his car on Bissonnet and hit a tree, causing his car to flip.

The boys -- ages 15 and 20 -- had cuts and bruises. Keisy died at the scene.

As the police started digging, they realized the story started before the accident at a nearby Chevron station where the family stopped after Keisy picked up the oldest son from work. Police said they may have gotten into some sort of disagreement with another driver there.

"There is a tape. There are a lot of people in the tape, but there is no apparent disagreement between Keisy and anybody that night at the store that we can see on video tape," HPD Homicide Det. Todd Tyler said.

But as the men headed home, they realized they were not alone. Someone was following them.

"The driver rolled the window down and said, 'Hey you better watch yourself,'" Tyler said.

Seconds later, police said, bullets started flying, hitting Keisy once in the neck.

"The 15- and 20-year-old [passengers] could have very easily been shot and actually were on the same side of the vehicle where shots were fired from," Tyler said.

It's a day that is engrained in Cecilia's mind -- one she can't get past until she knows who took her husband of three years just days before he would have celebrated his 29th birthday.

"It's just hard. I don't know why anybody would want to do this to him," Cecilia said.

Since they did not find many clues on the surveillance tape, HPD is hoping someone was at the Chevron or on Bissonnet at about 11:30 p.m. the night of the incident. They are hoping someone saw something that could help lead them to a suspect.

If you have any information, call Crime Stoppers at 713-222-TIPS. All tipsters remain anonymous and could be eligible for a $5,000 reward for tips leading to an arrest.