A South Florida man who is behind bars accused of shooting and killing his neighbor during a dog poop dispute is facing more charges after an alleged attack on another inmate.

Omar G. Rodriguez, 67, is now facing an aggravated battery charge in the incident at the West Dade Detention Center. He was already facing a first-degree murder charge in the June 2015 shooting of neighbor Jose Rey.

According to an arrest report, video inside the jail in a bathroom showed Rodriguez walk past the victim, 44-year-old Roberto Reye, and push and punch him.

Reye was treated at the jail then taken to Jackson Memorial Hospital to receive stitches for a cut on his ear. Reye is behind bars on aggravated battery and assault charges, records showed.

Rodriguez remains behind bars without bond in the shooting of Rey, who was taking his dog for a walk on Father's Day weekend when he got into an argument with Rodriguez about where Rey's dog was pooping, police said.

Rey was shot by Rodriguez and spent nearly a week in the hospital before succumbing to his injuries, police said.

Rodriguez told police he got his gun after he spotted what appeared to be a shiny object in Rey's hand, authorities said.