In 2016, Mitchell MacDonald was targeted and killed by Earthworm, who surgically removed his kidney. Michell's body was dumped in an alleyway.
Mitchell's corpse was found by the CCPD. Detective Joe West later discovered a link between Mitchell victim and Ryan Paulson's deaths, which he told CSI Barry Allen. Barry found out that Mitchell died from having his kidney removed and his body contained traces of the city's sewers. There, Barry found evidence that a meta-human with super-strength murdered Mitchell. Barry would later link Mitchell's death with Earthworm's killing spree.