A Hillsborough County judge sentenced 72-year-old Trevor Dooley on Thursday.
He was convicted of manslaughter in November, despite claims of self-defense.
Authorities say Dooley shot 41-year-old David James at a Valicro park in September 2010.
Dooley, who lived across from the park, was yelling at a skateboarder using a basketball court when James interceded.
Witnesses say Dooley flashed a gun, starting a struggle that left James dead.
James' then-8-year-old daughter watched him die.
Dooley testified he had no interest in a physical confrontation and only shot James because James was choking him.