Credit: Mark Konezny-Imagn Images The Chicago Blackhawks have signed defenseman Bowen Byram to a six-year, $75 million contract extension that carries a $12.5 million annual cap hit. The deal will officially begin next summer, coming shortly after Chicago acquired Byram from the Buffalo Sabres in a blockbuster trade that sent the No. 4 overall pick in the NHL Draft the other way. As part of the deal, Buffalo also received defenseman Louis Crevier and a future second-round pic