Eli Cohn used suicide bombers Melanie Singer, Will Mabyee to get to kill Chad Decker but was unsuccessful.("Serpent's Tooth") He then ordered two of his men to kill 3 peace ambassadors. He first appeared when he met with Jack Landry and when he was corned by Erica he revealed to Erica that his wife and child were subject to experimentation, similar to what Erica experienced when she was carrying Tyler. She then told him to leave inocents alone.("Unholy Alliance")