A $5,000 Crime Stoppers reward in now offered in this case, and there's new video to help the public find them.
The robbery happened on November 6, in the 500 block of Dale Street around 8:30pm.
Video footage of the murder scene shows a late-model white minivan approaching the trailer and then three men with guns jump out of the van and run toward the trailer entrance. In the video, all three of the men are then seen running back to the white van. In an attempt to flee the parking lot, the driver of the van struck a pole and the crash tore the sliding passenger door from the vehicle.
Anyone with information is asked to call the Harris County Sheriff's Office homicide unit at 713-274-9100 or Crime Stoppers at 713-222-TIPS (8477).