The Real Housewives of Salt Lake City star Mary Cosby's son, Robert Cosby Jr., has died at age 23, Us Weekly can confirm. TMZ was first to report the news on Wednesday, February 25, reporting that Robert Jr. died in Utah following a possible overdose. The cause of death has not yet been confirmed. "Our beloved son Robert Jr. has been called home to the Lord," Mary shared in a statement to Us Weekly. "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.