OpenAI Episode 3: Mr. Altman will not return as CEO; former Twitch CEO Emmett Shear will be its interim boss.

The board of directors at OpenAI, the high-flying artificial intelligence start-up, stood by its decision to push out its former chief executive Sam Altman, according to an internal memo sent to the company’s staff on Sunday night.

OpenAI named Emmett Shear, a former executive at Twitch, as the new interim chief executive, pushing aside Mira Murati, a longtime OpenAI executive who was named interim chief executive after Mr. Altman’s ouster. The board said Mr. Shear has a “unique mix of …

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