United Kingdom, Feb. 25 -- Mary Cosby believes her son is "at peace" following his death.

The Real Housewives of Salt Lake City star confirmed the death of 23-year-old Robert Cosby Jr. on Wednesday (23.02.26), two days after police found his body when they "responded to a possible overdose" and the tragedy has made her "heart ache".

Speaking on behalf of herself and husband Robert Cosby Sr., Mary told TMZ: "Our beloved son Robert Jr. has been called home to the Lord.

"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."

The medical examiner is still investigating a cause of death for Robert, who w...