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Clemens, who briefly hired Chamberlain for a project in 2009, said people who know Chamberlain are stunned.

“I believe there’s been a failure in his support system. I’m sad for that,” Clemens said. “I hope he will reach out to those who will help him.”

Chamberlain also worked as an independent contractor for The San Francisco Chronicle during the 2012 NFL season, doing social media to boost coverage for the San Francisco 49ers Insider iPad app, the newspaper said.

Chamberlain also taught a “Grass Roots Mobilization” course to graduate students in the public affairs program in 2011, said Anne-Marie Devine, a spokeswoman for the University of San Francisco. Chamberlain taught for one semester and wasn’t invited to teach another course, she said.

She said she didn’t know why he was let go because hundreds of adjunct professors come and go at the university.