Justin Whicker was the former head of a sex trafficking ring in Gotham. In 2014, Assistant District Attorney Laurel Lance became the second Black Canary and traced Whicker's ring to Gotham. Bruce Wayne became unexpectedly involved after having a confrontation with William. Bruce and Black Canary teamed up to stop Whicker and Laurel was able to make Whicker loose his hearing after testing out the Canary Cry device that Cisco Ramon added modifications to.
Arrow Season 2.5
In 2012, Oliver traced Justin's trafficking ring to Moscow. Justin attempted to escape from The Hood, and tried to convince him that another would take his place, but he was eventually killed with an arrow through the chest.