This episode originally aired June 17, 2019. When the body of a female prison guard shows up in a landfill, investigators suspect the prisoners in the facility where she worked. The medical examiner found an important clue, a "signature" element, which figured in two other murders.<hr><p style='color:grey; font-size:0.75em;'> Hosted on Acast. See <a style='color:grey;' target='_blank' rel='noopener noreferrer' href='https://acast.com/privacy'>acast.com/privacy</a> for more information.</p>