Officers were called about 3:30 p.m. to a home at 11604 South Komensky Avenue for a report of a person being attacked by a dog in the backyard, Alsip police said.
Authorities said Ford and the dog, which was described as a pet, both lived at the home.
The six-year-old Pit Bull was still aggressive when officers arrived and was shot and killed, police said.
No other incidents or complaints involving the dog were previously reported to authorities.