"Basically, we wanted them off the streets so they don't hurt anyone else," he said.
Authorities arrested two adults and two juveniles Tuesday evening after receiving an anonymous tip.
An investigation revealed someone shot Johnny Luckey through the kitchen window of his Hoods Lane home before entering about 11:30 p.m. Friday. The bullet hit Luckey in the torso while he sat on the couch.
Inside the house, the assailants fired again, striking Luckey again in the torso, Richmond County sheriff's Capt. Scott Peebles said.
Authorities believe that Luckey, who family members said had heart problems and relied on an oxygen tank to breathe, was alive for the majority of the time the assailants were in his home. When emergency responders arrived, they tried CPR on Luckey unsuccessfully.
"It's obvious that we don't see cases like this often, especially involving an elderly handicapped man," Peebles said. "As if the robbery wasn't bad enough, they killed him -- four able-bodied teenagers that could have physically been able to out-match him."
Luckey had moved to his home off Tobacco Road with his family in 1963, but had lived alone since his wife died six years ago.
Joseph Lashun Jordan, 18, of Ridge Run in Hephzibah, and Artavious Sylvester Feazell, 19, of Tobacco Road, were charged with murder, armed robbery, burglary and possession of a firearm during the commission of a crime, police said. They are being held at the Richmond County jail with no bond.
Authorities also charged Tracey Lamont Lindsey Jr., 15, of Walton Loop, and Rufus Khalid-Durand Van, 16, of Ridge Run, with murder and armed robbery. Both juveniles will be charged as adults and are being held at a youth facility.
Authorities said Feazell is the cousin of Luckey's housekeeper.
David Luckey said he was surprised to learn that Feazell was a suspect in the murder.
"What we knew of him, we didn't think he would do something like this," the victim's son said.
Luckey said the housekeeper was a neighbor who would drop by to straighten up the house.
Authorities do not believe that the housekeeper, who had previously lived with Feazell, was involved with the killing and burglary, Peebles said.
Luckey leaves behind three children, five grandchildren and two great-grandchildren.
His was Richmond County's sixth homicide of 2011.
Staff Writer Kyle Martin contributed to this article.