John Miller, 64, and Michael Miller, 31, are accused of killing Aaron Howard, 37, also of Abilene, Saturday morning.
Howard's fianceé, Kara Box, recently provided the cellphone video she shot to KXTS.
"If you come closer to me, I'm gonna kill you", the elder Miller reportedly could be heard yelling at Howard.
Screenshot of KTXS VideoMichael Miller opens fire on Aaron Howard over a trash dispute.
They've both been arrested and charged with murder. Michael Miller then opens fire as well, pulling the trigger on his shotgun. "That's when John [Miller] pulled a pistol out of his shorts", Box said.
Box starts screaming, "No, no, Aaron!" after her husband is shot in the chest and head. Box screams as she rushes over to Howard, now on the ground (blurred out in the video), "For a second I thought he was going to be OK, but he didn't make it", she tells the Star-Telegram.
Both sides appear to be slinging threats and vulgar language at each other, while both the Millers are seen armed with firearms.
"Hey, you hear he says he's going to kill me?" "You pulled a gun in front of my kids over. a mattress".
Howard is overheard saying, "shoot me" before someone off camera says, "you're dead, point it". The two continue to argue over whether Howard should be threatening Miller if he plans to show the video to the police, and Miller continues to urge Howard to "take a swing, go ahead".
The Millers mentioned that they're defending their homes, to which Box informed them that they're in an alley and not on their property.
Box said they had moved to that Abilene home in April, but they had never talked to the Millers until the morning of September 1.
Police believe that at least five shots were fired.
The investigation is ongoing, the chief said then.
The video shows at least four shots were fired during the confrontation, and Box said she was nearly shot by one of them. That mattress, Box told the Star-Telegram, was the conflict's catalyst. The argument escalates, Box steps between her husband and John Miller, and then Howard says: "C'mon, shoot me!" She said that she sat on the side of the road in shock, covered in her husband's blood, waiting for the police to arrive.
Howard then barked at his two armed neighbors to leave the scene, according to the report.
Box said Howard battled mental illness his entire life, but was getting help for a condition called IED, otherwise known as Intermittent Explosive Disorder, before he was killed.
The Taylor County district attorney declined to comment because he had not seen the video, and he asked KTXS for a copy.
"Video evidence like this is always graphic and very hard to watch, but it is consistent with the charges", said district attorney Jim Hicks.
"I stepped in between Aaron and John (Miller), then my ears started ringing from the gunshots", Box said in a telephone interview from her home in Abilene as she sobbed.
The father and son have been charged with first-degree murder. The two were released after posting $25,000 bail.
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