MARTIN COUNTY, Fla. – A tow truck driver in Martin County told investigators that the man who is accused of killing Florida Highway Patrol Trooper Joseph Bullock on Wednesday morning was upset over having to pay for the towing service. Trooper Joseph Bullock was killed Wednesday in a shooting at a I-95 rest stop in Martin County. Riviera Beach Police Officer Jemel Headings was off-duty when he saw Bullock was in trouble and pulled over to help him. The “Riviera Beach police officer, who was passing by, engaged the suspect fatally shooting him," FHP Col. Gene Spaulding said. DaWayne Watson, a firefighter-paramedic with the Riviera Beach Fire-Rescue Department, was on his way home when he saw Bullock was bleeding.