Cahan had come to Yahoo with the acquisition of Into Now.
The spend was designed to give Yahoo an injection of talent to help reinvent its mobile offerings at a time when its major revenue streams still depended on homepage and mail products.
Cahan was also embroiled in some politicking and abortive launches as the structures at Yahoo became more malleable, at one point overseeing the development of a doomed relaunch of Yahoo Instant Messenger.
Just as the Yahoo CEO Marissa Mayer was triumphantly navigating the firm into the later stages of its promising deal with Verizon, a series of October surprises has shifted her attention.
We reached out to the mothership for comment but were declined.