It’s been nearly three years since Kristin Cavallari’s brother Mike died. In a preview for Season 3 of E!’s Hollywood Medium with Tyler Henry, the clairvoyant helps the former Hills star, 31, reconnect with her late sibling. But many fans have forgotten how Mike sadly passed away.

What happened to Kristin Cavallari’s brother?

As previously reported, Mike was found dead in Grand City, UT, days after he was reported missing in 2015. Despite his issues with substance abuse, Mike — who was discovered in a “steep and rocky area” after crashing his car — died of hypothermia, and authorities ruled his death an accident.

However, on Hollywood Medium, Tyler Henry tells Kristin that drugs and alcohol played a part in Mike’s death. “They’re having me talk about two factors playing on someone’s mental state,” the 22-year-old psychic says in the sneak peek below. “But there’s an acknowledgement with this of more of an emphasis on the drugs and alcohol than even as the mental illness thing. It’s when we go down the drugs and alcohol route, it’s kind of like, there’s no saving me. That kind of triggered or kicked off some things.”

After confirming that Tyler’s reading is “so accurate,” Kristin opens up about the events leading up to Mike’s tragic death. “Mike dealt with, we think, bipolar disorder,” she explains. “He would go into these manias and think that, you know, everything’s great, everything’s fine. And then he would just crash and would be depressed, and it was just this constant up and down, up and down. And then you throw drugs and alcohol into the mix, and it would just enhance everything. It went on for years. He was dealing with some demons. There’s no doubt about it.”

Back in November, Kristin honored Mike in a touching Instagram post, detailing the emotional aftermath of losing her brother. “We lost him completely unexpectedly and it’s been a rough road for me and my family,” the mom-of-three — who shares Camden, 5, Jaxon, 3, and Saylor, 2, with husband Jay Cutler — wrote at the time. “I’ve had some incredible signs from him though-which give me a lot of peace-including one today.”

Hollywood Medium with Tyler Henry airs on E! Wednesdays at 9 p.m. EST.