Lauren dives into the Coldest Cases archive, playing one of her favorite episodes from 2019. December 16, 1935. Hollywood actress Thelma Todd is found dead in her car in a garage outside of Los Angeles. Although it seems to be a clear-cut case of carbon monoxide poisoning, some threatening letters sent to people who saw Thelma the day before her death opens the door to a fresh investigation. Today the actress’ cause of death is still listed as “unknown”.