Miriam Helmick was sentenced to life without parole for the murder of her second husband, Colorado businessman Alan Helmick.

“20/20” looks at the case of Mary Winkler and the trial that shocked a nation. "20/20" explores the 2012 killing of 16-year-old Skylar Neese.

This case also saw some heartbreaking developments, which would seem intriguing to true crime fans all around. 20/20 latest episode, which premieres at 9.00 PM EST on ABC on January 31 ...