Wray was hired in April 2001 to manage the day-to-day running of the creative department, with Dave Trott stepping back to become the executive creative director, along with his partner, Gordon Smith, and effectively working as a senior team.
However, the parties are said to have "fallen out". Trott and Smith will return to running the department.
Wray worked alongside the managing director, Kier Cooper, who left in April this year and was replaced by the former Lowe Howard-Spink board director, Steve Cooper.
Wray's hiring reunited him with Trott, for whom he worked as a creative group head at Gold Greenlees Trott between 1983 and 1991. Since then, he spent a year at both Miller & Leeves WAHT and J. Walter Thompson, before moving to Reay Keating Hamer as the creative director in 1994.
His career has included winning a D&AD silver award as a copywriter on Wieden & Kennedy Amsterdam's 1998 football-inspired "commentary" spot for Coca-Cola.
WTCS declined to comment on Wray's departure as Campaign went to press.