Sierra explains to Kelsey the 7 murders enacted by the Fast Food Killer, Paul Dennis Reid Jr. near Nashville,TN. Also featuring an additional case that bares a shocking resemblance. 

Sources: 

 https://allthingscrimeblog.com/2014/12/15/nashvilles-fast-food-killer-paul-dennis-reid-richly-deserved-his-seven-death-sentences/ https://murderpedia.org/male.R/r/reid-paul-dennis.htm https://en.wikipedia.org/wiki/Paul_Dennis_Reid https://www.reddit.com/r/todayilearned/comments/8mqgze/til_that_after_surviving_a_car_accident_and/?sort=old#bottom-comments https://www.reddit.com/r/todayilearned/comments/8mqgze/til_that_after_surviving_a_car_accident_and/?sort=old http://www.tblakebraddy.com/fast-food-killer-paul-dennis-reid/ https://en.wikipedia.org/wiki/Brown%27s_Chicken_massacre https://www.aclu.org/sites/default/files/images/asset_upload_file148_29827.pdf