Bellwood police Chief Jiminez Allen released a statement Friday night praising Davis Sr.'s work, saying Davis' "contributions to our community positively impacted everyone he served and served with".
Federal agents from the Bureau of Alcohol Tobacco and Firearms were sent to the scene in the central MI city of Mount Pleasant to assist local police.
The parents were identified by the school Friday evening as James Eric Davis, Sr., and Diva Jeneen Davis.
Police got a tip from a train operator just after midnight Saturday about a person standing near the tracks in the area where authorities had been searching for Davis Jr. since the fatal shooting.
His father was a part-time police officer in Bellwood for 20 years and assisted the department on special occasions.
Hours later, officers spotted Davis in a dorm hallway with his suitcases, acting strangely, Yeagley said, and they asked him to call his parents, which he did.
The gun used in a shooting at a Central Michigan University dormitory that left a student's parents dead was registered to the suspect's dad, according to police.
48, and Diva Davis, 47.
Davis Jr. was taken to a local medical center, where his parents picked him up later Friday morning.
Davis Jr. was hypothermic and not making sense when he was found, authorities said. Davis Jr. graduated from a high school in Plainfield, Illinois, about 30 miles southwest of Chicago, in 2016, said Tony Hernandez, Plainfield school district spokesman.
Meanwhile, the shooting sent Central Michigan University into lockdown mode, with students being told to take shelter inside their dorms and classrooms for hours.
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We are starting to learn more information about the victims.
"Mr. Davis was not ever reported, and we had no interaction that we're aware of with him in any negative fashion - with anybody - prior to this incident", he said.
Police obtained the name of the person Davis, Jr. feared and reviewed footage of him riding in an elevator and laughing with this person.
Davis allegedly escaped from the dormitory on foot, leading to a campus lockdown and a citywide manhunt for the alleged shooter.
Those who knew the accused killer say they could not imagine him perpetrating this unthinkable crime.
Authorities said Davis Jr. fled after the shootings, prompting an intensive manhunt in the area.
The office spoke to his mother and told her that there were concerns that Davis Jr. may be on drugs.
"He said someone was out to hurt him, someone was out to harm him", Yeagley said, adding that when officers pressed Davis for more details, he was "extremely vague".
"The mother said she too was concerned this could be drugs", he said.
CMU President George E. Ross said the university will be responding to this incident by re-doubling safety efforts and offering professional counseling to students after they return from spring break.
". We're not done yet, there were thousands of people on campus yesterday, and they're going to be dealing with this for the rest of their lives".