Foley had been publicly heard bashing his girlfriend’s ex, and multiple people close to him reported that he wished death on John. So was Foley the one to kill him?
The footprints did, in fact, link Foley to the crime, as his shoes matched almost perfectly to the prints found at the crime scene. The biggest piece of evidence was a bit of DNA that was found under John fingernails, assumedly from the struggle between him and his killer. The DNA matched Foley.
Foley did have an alibi; he said he was playing hockey at the time John was murdered. But, a development in DNA technology changed the course of the case.
Though a majority of the blood found at the scene was discovered to conclusively belong to the victim, there was a small percentage of the blood that belonged to the killer. This blood was also matched to Foley, which further cemented the case against him.
Source : https://www.distractify.com/p/who-killed-john-yelenic