Court records show a Kentucky man who police say fatally shot two people at a grocery store punched and choked his elderly parents at their home several years ago.
He was taken into custody soon afterwards, Jeffersontown Police Chief Sam Rogers said at a news briefing outside the store.
Bush has been charged with two counts of murder and 10 counts of felony wanton endangerment.
Cops arrived, and determined that a male suspect entered the store, and opened fire at a male victim, the chief said.
Police said an armed bystander confronted Bush and the two exchanged gunfire but both missed.
Jeffersontown officials are expected to give an update on the investigation Thursday morning.
Rogers couldn't speak to a motive and said the shootings were apparently random.
A Jeffersontown police dispatcher said officers remain on the scene.
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Police said Stallard was shot in the back of the head inside the store and Jones was killed in the parking lot.
Emergency medical technician Eric Deacon, who happened to be at the store when gunfire broke out, said he saw a woman hit and went to help her but realised there was nothing that could be done. "I knew there was nothing I could do".
Police received a call about 3 p.m. reporting the shooting, Rogers said.
"[My father] didn't realize it was [the shooter] till he had already seen the gun by his side", said the son, who was at the scene of the shooting, according to a local Fox affiliate.
"She was gone, there's nothing I could do", Deacon said. "Whites don't kill whites, '" Zinninger said.
The store is located on the eastern outskirts of Louisville.
"We are shocked and saddened by the shooting", Kroger said in a statement.