'RHOSLC' star Mary Cosby's son Robert dies at 23

Robert Cosby Jr., the 23-year-old son of "Real Housewives of Salt Lake City" star Mary Cosby, has died, police confirmed.

"Our beloved son Robert Jr. has been called home to the Lord," Mary Cosby told TMZ in a statement. "Though our hearts ache, we take comfort in God's promise and in knowing he is finally at peace. We are grateful for your prayers and trust in the Lord to carry us through this time of sorrow."

Wilking said the investigation into Cosby's death remains active, revealing that authorities responded to an overdose call on Monday and that the death has now been passed to the medical examiner's office.

Mary Cosby has been a principal cast member on the Bravo series for several years, forming part of the backbone of the original cast. She stepped away for the third season before later returning.

Robert Cosby Jr. has been featured several times on "RHOSLC," including in a candid and emotional conversation he had with his mother over substance abuse issues.

The 23-year-old is the only child of Mary and Robert Cosby Sr., who wed in 1998. The senior Cosby was previously married to Mary's grandmother, a subject of much speculation on and off the show.

Mary, whose conversation with Cosby Jr. was lauded when it aired, for its tenderness, has stood by him in recent years, speaking openly about his struggles.

"I can just only push him, encourage him and love him. And that's what I'm doing," she said during an appearance on SiriusXM’s "Reality Checked" in September. "I have hope and I believe in him. ... I know he's got all the tools and he's got all the will, the willpower that he needs and the support."