Dan Porter, head of OMGPop, leaving Zynga

(AP)—Dan Porter is leaving Zynga a year after the online game maker bought his company, OMGPop, for $183 million.

Zynga Inc. said Tuesday that Porter has left Zynga's New York office. Sean Kelly has been named as the studio's head.

OMGPop, a mobile game maker, created "Draw Something," a once-popular mobile game that has since fizzled. Porter's departure comes as Zynga gets ready to launch the game's successor, "Draw Something 2."

Kelly has been with Zynga since 2009.

San Francisco-based Zynga's fortunes have declined with the popularity of its games, which include FarmVille. Revenue has flattened along with its stock price.