Mancini went through a period of reflection, as he blamed himself for Kim’s death.

[…] Kim’s mother flew from South Korea to Las Vegas to be with her son before the life support equipment was turned off. Three months later, she committed suicide by drinking a bottle of pesticide. The bout’s referee, Richard Green, committed suicide via self-inflicted gunshot wound on July 1, 1983.

Aftermath of Kim Duk-koo’s death, Wikipedia