Johnson intends to interrogate Deek and exploit him to assist Marston's planned assault on Fort Mercer. Several days after his capture, the Williamson gang kidnaps Bonnie MacFarlane from Hennigan's Stead, and holds her under threat of execution. A Williamson gang member rides to Armadillo to deliver the ultimatum to Johnson, initiating the mission "Hanging Bonnie MacFarlane".
Johnson pragmatically accepts the exchange, carrying a restrained Deek to Tumbleweed alongside Marston, Eli and Jonah. The gang members, awaiting their arrival, ambush them during the exchange. Ironically, Deek is promptly killed by his own gang which he swore by in the cross fire (though it's most likely that this was accidental). His death is announced in the Blackwater Ledger, which notes his age at time of death as 34.