Benjamin Middendorf, from St Cloud, Florida, is facing murder charges after shooting and killing his brother during an argument over a cheeseburger, police said.
Benjamin called 911 on Thursday night and told police he had just shot his brother, Nicholas, at their home, an arrest report said.
Nicholas Middendorf, 28, was later declared dead at the home from a single gunshot wound to the chest, the Orlando Sentinel reported.
In the 911 call, Benjamin is heard screaming and shouting at a dispatcher that he was "trying to hold the pressure" on his brother's chest.
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Their mother, who was home during the incident, told police she and Nicholas had just returned from a bar when the brothers started arguing, the arrest report said.
She could not remember where she was inside the house, but said she heard Benjamin say he was going to shoot Nicholas.
She then heard a single shot and found Nicholas on the floor in the living room.
She is also heard on the 911 call screaming incoherently at the dispatcher to get police and an ambulance.
Police talked with Benjamin, who said he does not drink alcohol and was home when his mother and brother came back from the bar. Nicholas started bullying him, Benjamin told police, and they argued over a cheeseburger.
He said he could not remember much after that, according to the report.
Police said Benjamin owns a 9 mm pistol and had blood on his clothes and body.
Benjamin is facing a charge of first-degree murder and is being held in the Osceola County Jail.