What led to the death of Kristin Cavallari's brother, Michael?

Kristin Cavallari's Brother Found Dead, Read Her Heartbreaking Statement

According to a new report, Michael Cavallari did not kill himself, as many have speculated.

"It appears Kristin Cavallari's brother did not commit suicide, and most likely died simply from exposure to the elements," TMZ reported on Friday, citing law enforcement as their source.

5 Facts You Should Know About Kristin Cavallari's Brother Michael

On Thursday morning, Michael's body was found in Grand County, Utah, three miles from where his Honda Civic was discovered abandoned. At the scene, police said there were "no signs of major trauma and no suicide note," nor was there any evidence of drugs or alcohol.

"Temperatures in the area were frigid--in the teens at night and 30s during the day--and the operating theory is what killed [Michael]," the site explained.

As for what happened to Michael's vehicle, which was found about 100 yards from the road, the mystery has yet to be solved, and it's hard to say why Michael left the vehicle as opposed to remaining inside, where it was surely much warmer.

On Instagram, after her brother's death was confirmed, Kristin shared a throwback photo and special message for Michael.

"My heart is in a million pieces," she wrote. "Mikey, I could always count on you to make me laugh. You had such a good heart and will be forever missed. I'm at a loss for words but I know u are in a better place and finally at peace. I love u so much RIP."