Death by Magic by Russ Crossley

Wizards work for large corporations. Now a murdered corporate wizard begins an investigation by Detective Owlen Vay of the Ye Olde Vancouver PD. When Owlen calls in PI Rex Filagree (his oldest friend) to assist in the investigation, they travel the mystical world of corporate sorcery to find a killer.
A world where wizards, magic, and murder mix, and the guilty always pay.