The killer is revealed to be Echo , an Earth-19 doppelgänger of Cisco who framed him for the crime. Subplots:
Continues to track down the villain Ramsey Rosso (Bloodwork). Watch The flash 2014 s06e05 hdtv x264-sva-1
This is a Cisco-centric episode where Barry Allen and Iris West-Allen are largely absent, taking a "pre-Crisis" vacation. The killer is revealed to be Echo ,