A woman who was found mentally incompetent in 2008 has been found guilty of suffocating a boy in 1997. Karla Sevilla pleaded guilty to second-degree murder Monday for the October 1997 death of Michael Malcolm Jr. His body was found behind a West Palm Beach apartment trash bin with a trash bag over his head. Sevilla denied any involvement before a DNA taste proved otherwise. She received a 30-year sentence.