This episode originally aired June 27, 2019. The victim had ingested a massive amount of cyanide. An unlikely clue - a flaw on a mailing envelope -- exposed a murderer who was willing to kill innocent people to get the one person he wanted.<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>