A Texas farmer confessed to murdering 13 people, including his wife and eight stepchildren, whom he buried in a mass grave on his property in 1926. George Hassel's methodical killings revealed a decade-long pattern of manipulation, theft, and violence masked by charm and lies about his tragic past. Hassel murdered 13 people across two states between 1917 and 1926, including Marie Vogel and three children in California, and his entire blended family in Texas, burying them in shallow graves.