William Reiss, 68, was shot four times in the head in his Polk City home on January 3.
One of three young men arrested over his murder is Gerjuan Jackson – an 18-year-old official FEMA contractor.
Jackson was arrested in Mobile, Alabama last week with two other suspected accomplices.
Jackson allegedly went inside Reiss’ home and gunned him down while Kenley Campbell, 22, and Darril Lamar Rankin Jr., 22, waited outside in the car.
Once the shots were fired, the other two men allegedly stole the victim’s firearm collection and his flat screen television.
They are also accused of stealing his truck.
Police said Jackson set the truck on fire in a secluded area back in Alabama.
The three men have been charged with first-degree murder, attempted first-degree murder, armed burglary with assault/battery, 13 counts of grand theft of a firearm, robbery with a firearm/deadly weapon, conveyance burglary and grand theft of a motor vehicle.