Andrew Fastow, Enron's former CFO, returns to the stand for more cross-examination. After two days last week of intense questioning by Skilling attorney Daniel Petrocelli, Ken Lay's team will take over Monday morning. Lay's lead attorney, Mike Ramsey, will conduct cross-examination that many expect to last a couple days.

Fastow, more than any other government witness, gave the jury a first hand account of what happened behind closed doors on Enron's 50th floor executive suites.

The 44-year-old, who pleaded guilty and will spend a decade in prison, gave damaging testimony about both Skilling and Lay. But Fastow was the first witness to directly point the finger at Lay. That will likely draw a lot of questions from Mike Ramsey on Monday morning.