NEW: Las Vegas judge shoots down petition to lower murder charge against a man accused of killing an 11-year-old boy in a road rage incident.
The rejection comes as 23-year-old Tyler Johns allegedly laughed at the victim's family in court.
Johns is accused of shooting 11-year-old Brandon Dominguez-Chavarria on the 215 Beltway last year.
The man allegedly fired his weapon when he and Brandon's stepfather were jockeying for position on the freeway.
During a court appearance this week, District Judge Jacqueline Bluth was seen grilling Johns about an accusation that he smiled and laughed at Brandon's family in court.
"I don't know what happened... I was told you were smiling at the family, laughing at the family, and calling them names," Bluth said.
"If it did happen, it will never happen again."
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