Shiring announced his resignation from the Encino-based Infinity Ward via Twitter, as spotted by 1UP, saying "After almost 6 years at Infinity Ward, I resigned today. I'm incredibly proud of everything we accomplished and I'm going to miss everyone." He follows fired co-founders Jason West and Vince Zampella—now leading Respawn Entertainment, and recently departed lead designer Todd Alderman and lead software engineer Francesco Gigliotti.

Shiring worked at Infinity Ward for five years, 11 months, according to his LinkedIn profile, departing the same day that Zampella and West announced their new studio backed by Electronic Arts, Call of Duty publisher Activision's chief rival.

The bleeding of key talent at the Modern Warfare developer doesn't stop there, as we've been told another development lead on the team has also quit the studio. Modern Warfare 2 lead designer Mackey McCandlish gave his goodbyes to his Infinity Ward cohorts earlier today via Facebook. McCandlish was with the developer for eight years, one of the IW team members credited with additional writing duties.