According to authorities, one appeared to have been shot and the other beaten.
The bodies were found near Wentworth Woods in Calumet City.
"I just started crying for them. That's all I could do was cry," said Tawanda Stewart.
Stewart was walking to the local library when she caught a glimpse of a man and woman face down in the weeds.
Police say he appeared to have been shot. He was between 50 and 70 years old, wearing a flannel shirt and suspenders. The woman who was lying along side was roughly the same age and looked like she had been beaten to death.
"That's sad for them to be out there like that. I know their family was worried. They were alone, just the two of them together," said Stewart.
A small subdivision of about a dozen homes is the closest neighbor to the section of the forest preserve where the bodies were found. Residents report seeing nothing unusual. But on Monday night they all asked the same question.
"How could somebody do this to a person? This is somebody's grandfather, just family, family. That's all that kept running through my head," said Stewart.
The Cook County Medical Examiner is trying to determine when these two people died and their identities. Both bodies were found without any type of identification on them.