The mistress of a disbarred Chappaqua lawyer accused of murdering his wife took the stand Monday.

Prosecutors say Carlos Perez-Olivo had a sexual relationship with Illana Poole for about 10 years while he was still married.

Poole told the jury that she met Olivo at a shoe store in Puerto Rico when she was 21. She testified that the then 44-year-old attorney had a sexual relationship with her for about 10 years, even though she got married and had two children.

The defense, however, says the affair was over before the November 2006 murder and that the two were just friends.

Two nurses also took the stand Monday and described a frantic scene at Northern Westchester Hospital moments after the murder. When one nurse asked Olivio what happened, she claims he said the shooting was his fault and that he should not have fought with the suspect.

Carlos told police that a Hispanic man forced him off the road as he and his wife were coming home from the city. The defense claims the man jumped into the backseat, there was a struggle for the gun and shots were fired into the back of Peggy's head and Carlos' abdomen. But the prosecution believes Carlos killed his wife to cash in on a $900,000 life insurance policy.

Poole will be back on the stand Wednesday when testimony continues.