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DALLAS (CBSDFW.COM) – More than a month after a Dallas film critic was killed in a crosswalk by a driver, his parents are still wondering who did it and why did the driver left their son in the road to die.

“The thought that someone could take a life and then go on with theirs, without giving a thought to what they had done to our family, is unbelievable,” said Lucy Murray, the mother of film critic Gary Murray.

Back in April, while attending a film festival, Gary Murray was killed as he tried to cross Mockingbird Lane near the North Central Expressway access road. Murray was in the crosswalk and had the right of way, according to investigators, when a pickup truck turning right from the access road onto Mockingbird Lane hit the 53-year-old film critic. The driver never stopped.

Friends and family members at the Angelika Film Center on Sunday held a memorial screening of Gary Murray’s favorite movie, “The Blues Brothers.” Friends who organized the screening said that it was important for them to show his parents just how much he meant to so many people.

Many, however, expressed frustration that they have not been able to provide the family with closure. “We just don’t know if we’ll ever know who did this,” said Murray’s father, Charles. “They have to have an awful guilty conscious.”

To which Murray’s mother added, “Or no conscious at all.”