Twitter COO Ali Rowghani tweeted his resignation this morning, after Twitter submitted an “8-K” document to the Securities and Exchange Commission saying he had resigned.

Last night Re/code reported there might be an executive shakeup at Twitter, and Rowghani’s resignation followed this morning.

It was rumored that the exec was taking the heat for a range of issues, including the social media app’s lack of growth and innovation and for selling 300,000 shares of stock. He also seemed to be unofficially demoted when newly hired Product VP Daniel Graf was told to report directly to CEO Dick Costolo rather than to Rowghani.

He’ll be staying on at Twitter as strategic advisor, according to the company.