Now, the two suspects are in police custody.
"This doesn't happen here. This is a pretty rare event," said Boris Stojakovic, who manages a building across the street with his family.
Investigators said it happened at 10:30 a.m. on the 8500 Block of West Catherine in Chicago's O'Hare neighborhood.
"We're actively checking that all our doors stay closed, and notifying our residents to make sure not to let anyone in the building they're not expecting," Stojakovic said.
[Ads /]
Police said the 80-year-old man was inside a home on the block when the suspects, a man and a woman, knocked on the door. After he opened the door, the suspects entered the home without permission and then a fight broke out.
Police say the 80-year-old, a FOID card holder, shot at the suspects, hitting the man in the chest. The woman was not injured.
One woman, who lives on the block and didn't want to show her face out of fear for her safety, said she is heartbroken for her neighbor.
[Ads /]
"I was in shock when I heard it, because it's like in the middle of the day, in the morning, and something like that happens so close to your home, it's really scary to hear," she said.
The suspects drove to Resurrection Hospital, where the victim is also being treated. The 80-year-old man and the alleged invader he shot are both in critical condition.