America's Got Talent have been witness to some epic moments and incredible wins, but they have also experienced heartbreaking losses.MORE: Simon Cowell reveals bold prediction for Carrie Underwood after phenomenal AGT performanceSimon Cowell, often known for his icy and straightforward demeanor, was recently unexpectedly candid about how much it has affected him to experience the passing of so many of its contestants through the years.Speaking with People Magazine, the star opened up about mourning the death of Nolan Neal, as well as Nightbirde, whose real name was Jane Marczewski.WATCH: Simon cries while remembering Nightbirde's auditionMORE: Divisive AGT live performance leaves Simon Cowell speechlessNolan died aged 41 on 18 July, though authorities have not yet determined the cause of death. The Nashville-based musician appeared on Season 15 of America's Got Talent as well as on seasons ten and eleven of The Voice. He had previously revealed during his audition for AGT in 2020 that he was in recovery from addiction, and said he hadn't touched "the hard stuff" in 15 years.Speaking of the tragic passing of several contestants, Simon admitted: "Unfortunately, it happens too much over the years." Nolan was known for his song LostHe added: "I was thinking about this the other day.