FOX4 News.Related: Transgender woman fatally shot in parking lot of Dallas apartment complexThat witness also said that Walker eventually caught up to the woman, stood over her, and fired multiple shots while she was on the ground.According to the affidavit, the witness claimed Walker and the victim had gotten into a dispute over a video of an intimate counter of the two that Mack was threatening to post on Snapchat, reports Dallas ABC affiliate WFAA.Police later found a post on Richey’s Facebook that read: “Brand new video on my private snap in jusssst a minute, y’all have to see how nasty I got with this [explicit slur].”Walker is currently being held in Dallas County jail.