(Newser) – Marissa Mayer has fired COO Henrique de Castro, 15 months after she snatched him away from Google on an outsized four-year package worth an estimated $62 million. That was Mayer's first big hire as CEO, but he hasn't been able to boost Yahoo's flagging ad revenue as much as she'd hoped, the LA Times reports. De Castro will get a parting bonus of $20 million in restricted stock, Business Insider observes, to go with the $39.2 million in cash and stock earned in 2012.

In a memo to staff, Mayer confirmed that she'd shown de Castro the door, Kara Swisher at re/code reports. It won't come as a shock, Swisher adds; her sources in the company have been calling him "dead man walking" in recent weeks, and he had a tense relationship with Mayer and her entire inner circle. "They just did not get along and did not hide it at all," one source said. "It was really awkward." Swisher doesn't expect Mayer to hire a replacement. (Read more Marissa Mayer stories.)

