The Hall County Sheriff's Office 29-year-old Lorenzo Moss was found in Brown Deer, Wisconsin, after investigators determined he was involved in 68-year-old Andrew Donaldson's death.
Deputies said Moss is Donaldson's grandson, but investigators haven't determined why Moss traveled to Georgia to see Donaldson.
Investigators said an autopsy revealed Donaldson was shot and believe the fire was set in order to cover it up.
The Hall County Sheriff's Office 29-year-old Lorenzo Moss was found in Brown Deer, Wisconsin
The fire happened just before 6:30 a.m. on Feb. 14 in the 5000 block of Meadow Drive off McEver Road.
Hall County firefighters said they arrived to find heavy fire shooting through the roof and side the home.
Firefighters found Donaldson dead inside.