Carolyn Dukeshire, 62, pleaded guilty to second-degree murder Thursday in the July 2012 shooting of 64-year-old Martin Mazur, according to KeysNet.com.
Dukeshire, who was facing a first-degree murder charge and made a deal with prosecutors, submitted a statement to the judge saying she was remorseful and would pay the rest of her life for losing her composure.
Police say Dukeshire had approached Mazur outside his Conch Key home and asked him for a can of Busch Light.
"Do you have a cold beer for me?" she asked, according to a Monroe County Sheriff's Office report.
"I have absolutely nothing for you," he replied.
That's when Dukeshire, who had no previous arrest history in Monroe County, shot Mazur five times. He later died at a nearby hospital.