Friday, August 1st 1980 Kingfish Boat Ramp Murders Dr. Juan Dumois, Eric Dumois age 13, Mark Dumois age 9 and Robert Matzke The Kingfish Ramp Murders. A person approached the Dumois vehicle, pretending to have an injury and asked for a ride. The subject got in the car with the Dumois family and Robert Matzke, then shot and killed all four. Friday, August 01, 1980 Dr. Juan Dumois, Eric Dumois age 13, Mark Dumois age 9 and Robert Matzke On the date of August 1, 1980, five people were shot, four of them fatally in the City of Holmes Beach. This case remains under investigation by the Holmes Beach Police Department. Dr. Juan Dumois, 47, his sons Eric, 13 and Mark, 9, and local resident Robert Matzke, 60, were murdered by an unknown assailant. Dumois’ brother in law, Raymond Barrows, 54, was also shot but survived. Barrows died of natural causes in 1982. On August 1, 1980 at 5:00p.m, Dumois, his sons, and Barrows returned from a fishing trip and loaded their boat at the Kingfish Boat Ramp. After pulling away from the ramp, they were approached by a white male on a bicycle. The subject stated that he had injured his ankle and asked for a ride. He then loaded his bicycle into the boat and got in the back seat of Dumois’ station wagon with the children. Dumois pulled out and proceeded westbound on Manatee Avenue from the ramp. The subject immediately opened fire in the vehicle striking all of the victims in the back of the head with a .22 caliber weapon. The vehicle then jackknifed on the north shoulder of Manatee Avenue just west of the boat ramp. The subject then got out of the vehicle and rode westbound on Manatee Avenue on his bicycle. Matzke, working in his yard at a nearby condominium, observed what had taken place and pursued the subject to the parking lot of a nearby grocery store. Matzke and the subject exchanged words, and he was shot in the head by the subject. Witnesses then observed the subject load his bicycle in a tan colored vehicle at the grocery store and leave eastbound on Manatee Avenue.