RHOC Alum Lauri Peterson's Son Josh Waring's Cause of Death Confirmed

The cause of death for Josh Waring, Lauri Peterson’s son, has been confirmed. 

According to the autopsy report obtained by PEOPLE, the Orange County Sheriff-Coroner Department indicated Waring's death was ruled as an accident as a result of the use of fentanyl, methamphetamine and olanzapine (an antipsychotic typically used to treat schizophrenia).

In a post shared on her Instagram account on April 6, the former Real Housewives of Orange County cast member announced that Waring had died on March 31 at the age of 35. “It is with a shattered heart that I write this post to let you know that my sweet Josh left this earth Easter Sunday,” Peterson, 63, previously wrote.

The heartbreaking carousel post featured photos from Waring’s childhood, shots of him and his daughter Kennady as well as a photo of Peterson and Waring at her 2007 wedding. 

“No one can ever prepare you for this feeling of such deep loss,” the former Bravo personality continued in her post's caption.

Peterson also mentioned that Waring had “fought every single day for most of his adult life, for his life,” adding that “this past Sunday, the challenge was too great.”

“He received the most joy, pride and purpose through his daughter Kennady and watching her grow and thrive over the years,” she concluded.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer​​, from celebrity news to compelling human interest stories. 

Three years after Kennady was born in 2012, the former reality TV star formally adopted her granddaughter in 2015 while Waring and his then-wife continued to deal with their own struggles.

“Not everyone understands those suffering from substance abuse disorder, but I am forever grateful for your understanding and the impact you made on his life,” Peterson told Bravo's The Daily Dish in October 2015.

Commenters on Peterson’s tribute to her late son offered support and guidance for the former Bravolebrity and her loved ones.

“I lost two of my sons on the same day in April 2016 to Fentanyl. I know this pain so well. Im so very very sorry,” one user wrote. 

Peterson’s RHOC community left their support on the post as well. “Lauri, this is so heartbreaking. Praying for peace and comfort for you and your family. I can’t even begin to imagine this kind of loss. My heart aches for you and what you all went through all these years. You are a great mom. Sending you a big hug and all my love and prayers. ♥️♥️♥️🙏🏼🙏🏼🙏🏼,” Lizzie Rovsek commented.

If you or someone you know is struggling with substance abuse, please contact the SAMHSA helpline at 1-800-662-HELP.