Quintal's body was discovered Saturday near a dam roughly 300 yards from the Honor, Mich., cabin she vanished from on Oct. 17.
The day Quintal disappeared, the single mom made a desperate call to family members, claiming two men were outside the cabin shooting while she was indoors.
Benzie County Undersheriff Kyle Rosa told local station WPBN Monday that the results of an initial examination of the body seem to indicate otherwise.
"We did not see any evidence of there being another party out there shooting back at her or doing things that were described, I just can't explain it," said Rosa. "Not sure what her state of mind was at that time, whether it was a medical event. We do feel that she was there the entire time."
The exact circumstances of her death remain a mystery. The official cause will be determined by the medical examiner's office.
Toxicology results, which could help authorities determine how Quintal ended up in the water — or explain her distressed phone call to relatives — are pending, the Detroit Free Press reported.
Police and Quintal's family have speculated a medical issue might be to blame, according to the report.
She had suffered a head injury several months before her disappearance, her sister told the outlet.
Initial responders found multiple bullet holes and casings in the cabin where Quintal was staying, but she was nowhere to be found, reports said.
There was no blood or evidence that anyone had been injured, but her 9mm gun was on the floor, officials said. She also left behind her personal belongings, including her vehicle, cellphone and purse, authorities said.
Comment: A different report states that her 9mm was found outside while her cellphone and boots were found on the roof of the cabin. If a person is going to walk around a swampy, desolate area you'd think that they would take their boots and cellphone with them, not to mention their pistol since they believed they were being attacked.
Quintal's family was part of the volunteer search and rescue team to find her on Saturday.
"The search is over," the family said in a Facebook post that evening. "We have not stopped searching for Ada for the past 9½ weeks. Today we found her. We are heartbroken as the search did not have a positive ending."
Comment: There are a number of profile points in this unfortunate story that align with the Missing 411 data that author David Paulides has collected. See: