Adam, 39, died of overdose in Las Vegas on Friday, leaving his family utterly devastated and shocked.

“You will always be in my heart! I love you Adam. ,” Rick wrote alongside a photo of himself smiling with Adam at a bar.

Previously, a representative of the family, Laura Herlovich, confirmed Adam’s death to the Las Vegas Review-Journal.

“Our family is extremely saddened by the death of Adam. We ask for privacy as we grieve his loss,” the statement read.

Speaking to Fox News Digital, Rick revealed the exact cause of Adam’s death, saying that fentanyl was to blame.

“Yes, I can confirm Adam died from a fentanyl overdose,” the reality-show star said. “The fentanyl crisis in this country must be taken more seriously. It seems it is just flowing over the borders and nothing is being done about it. We must do better.”

Fans, as well as some of Rick’s celebrity friends, were quick to share messages of condolence.

“I’m so sorry man,” wrote Donald Trump’s son, Donald Trump Jr.

Adam’s brother, Corey Harrison, also paid his tribute to his late sibling on Instagram, sharing an old baby photo of the two of them in a bath.

“Wax wtf I will always love you bubba,” he captioned the image.

Adam was Rick Harrison’s second child from his first marriage to Kim Harrison. Rick later went on to marry his second wife with whom he has son Jake.

While we saw Rick and Corey running the and appearing on the show, Adam was not as involved, although it has been reported that he did work with his father.

The Centers for Disease Control and Prevention reports overdose deaths, including synthetic opioids, raising 56.6% from January 2020 to 2021.

The Drug Enforcement Agency lists fentanyl as a Schedule II controlled substance “that is similar to morphine but about 100 times more potent.” Depending on a person’s body, even two milligrams, which is less than a grain of salt, can be lethal.

Our thoughts and prayers go to the Harrison family.

Rest in peace, Adam.

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