May 08, 2010 at 06:07 AM EDT

The fate of Fox’s Lie to Me is unknown but the show’s head writer-cum-executive producer isn’t sticking around to find out whether the crime drama is coming back in the fall. Shawn Ryan (The Shield, The Unit) used his Twitter account Friday to explain why he’s leaving the struggling series that stars Tim Roth and Kelli Williams. “I had a great year working on the show and helped develop a team that’s ready for more responsibility,” he wrote. “Time for me to go …When I took gig, I had things in development, nothing in production. Now with Terriers and possibly Ride-Along, too much work.”

Terriers is a drama about private investigators that Ryan is developing for FX while Ride-Along is an ensemble cop show that’s up for fall consideration at Fox. “As for timing, this allows studio time to give network succession plan to increase odds of pickup,” Ryan continued via Twitter. “Still very excited to show you 12 episodes we have in the can. The great Howard Hessman guest stars in one of them.” He goes on to tease that Melissa George (Grey’s Anatomy) will guest star for three episodes.

Lie to Me returns to Fox’s schedule on June 7.

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