STARKE, Fla. (AP) — A man convicted of killing a traveling salesman during a robbery is set to be executed Tuesday evening in the first lethal injection this year in Florida. Ronald Palmer Heath, 64, is scheduled to receive a three-drug injection starting at 6 p.m. at Florida State Prison near Starke. Heath was convicted in 1990 of first-degree murder, robbery with a deadly weapon and other charges in the killing of Michael Sheridan the previous year.