Jyle Venedict is the main antagonist in The Proxy Murders. Jyle is a Proxy Killer under the criminal organization/cult known as "The Proxy." His job is to assassinate people targeted by the Proxy's clients, who feel that the targets have done them wrong. However, as seen in Chapter 2, immediately after killing the targets and being paid by the Client, Jyle also kills the Clients for reasons unknown currently.
Not much is known about Jyle Venedict. More will be known as the story develops.