"They did a horrendous thing and they need to pay the consequences," the victim's daughter-in-law, Barbara Belton, told NBC News.
"They just kept hitting and hitting him," she said. "He was an 88-year-old man. Even if they wanted his money and he didn't want to give it to them, they didn't need to do that."
Belton, who survived being shot in Okinawa during the war, was in his car in the parking lot outside his Eagles Lodge when he was attacked on Wednesday night.
Both Glenn and Adams-Kinard have previous arrest records, including assault convictions.
But Odell Kinard said he was shocked to learn his nephew, who was a standout basketball player, was accused of killing a man.
"It really hurt to hear that," he said.
"He has to take responsibility," he added. "But the family is praying he gets 10 years or less."