Margaret Rudin served 20 years in prison after a jury convicted her of murdering her husband. It was a decision one juror said she’s always regretted, so she wrote Rudin to apologize shortly after trial, leading to them exchanging letters for two decades. #ABC2020 http://abcnews.com/2020 | ABC 20/20

65-year-old Ron Rudin disappeared in December 1994. Investigators discovered his skull and charred bones in a reservoir outside Las Vegas about a month later. His wife, Margaret Rudin, says in our new #ABC2020 interview, she was "in shock" after husband's remains were found in desert. Watch Friday at 9/8c on ABC. http://abcnews.com/2020 | ABC 20/20