Defense testimony is scheduled to begin Wednesday in the federal extortion trial of Karen Sypher.She's accused of demanding millions of dollars from U of L basketball coach Rick Pitino in exchange for her silence about a sexual encounter they had in a Louisville restaurant in 2003. Prosecutors rested their case Tuesday after a week of testimony from nearly two dozen witnesses.It's not clear if Sypher will be called to the witness stand.She's also charged with lying to the FBI and retaliating against a witness.