For seven years Rizzo was the CIA's chief legal officer. And Congress as well as a grand jury put him through the buzzsaw about destruction of the video tapes detailing the CIA's enhanced interrogation of Abu Zubaydah.
That's all described in his 2014 book "Company Man" Thirty Years of Controversy and Crisis in the CIA." Here you can order it from Amazon.com.
Many might buy the book to get a peek inside that clandestine organization. However, it's worth the cost just to read how a lawyer, usually a low profile player, winds up the focus of politicos and media. He describes that ordeal with bemused objectivity. Never again could we view a Congressional hearing aired on C-Span without being totally cynical about the agendas of everyone in the loop.