The 2000s witnessed a wave of lesser-known killers whose gruesome crimes are often overshadowed by more high-profile cases. From the brutal murders committed by Richard McCroskey and Dena Schlosser to the tragic events orchestrated by Ronald Gene Simmons and Steven Spader, their actions leave a haunting mark on this decade. These lesser-known killers remind us that behind the headlines are real people who caused immeasurable pain and suffering to their victims and their families.