"The Real Housewives of Salt Lake City" star Mary Cosby seemed concerned but hopeful about her son Robert 's future in an Instagram post shared earlier this month ... but 2 weeks later, he was dead. On February 7, Mary posted a picture of her 23-year-old son along with the caption "Thank you all for your prayers. Love you." She commented ... "#godfirst Love you all. My Beautiful Son.. I love him sm." As we reported ... Robert Cosby Jr. died Monday in Utah. His cause of death is unclear, but

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