WILMINGTON, Del. (AP) _ A politically connected lawyer's claim of how his mistress died is ``ludicrous'' and ``defies common sense,'' a prosecutor told the jury during closing arguments in the murder case Wednesday.

Thomas Capano, 49, lied to police, psychiatrists and his own lawyers when asked what happened to his mistress Anne Marie Fahey, the governor's 30-year-old secretary, prosecutor Colm Connolly said.

Connolly said it took Capano 2 1/2 years to come up with his story: that another mistress accidentally shot Ms. Fahey and that he kept quiet to protect her.

``Ladies and gentlemen, that story is ludicrous. It defies common sense,'' Connolly said. ``The defendant thought he would get away with murder.''

The jury was expected to get the case Wednesday night.

Ms. Fahey was last seen dining with Capano in a Philadelphia restaurant in 1996. Capano at first told police and others that he knew nothing about her disappearance.

But at his trial, he admitted that Ms. Fahey died at his house that night and that he crammed her body into a cooler and dumped it at sea the next day with his brother Gerard's help. Capano said his longtime mistress Deborah MacIntyre accidentally shot Ms. Fahey.

The prosecutor said if that were true, then Capano, a member of a wealthy Delaware construction family and a former gubernatorial aide, could have simply called for help.

``If anybody was going to be given the benefit of the doubt, it was the defendant with his political connections,'' Connolly said.

Ms. MacIntyre denied being at Capano's home the night Ms. Fahey died. She testified against him, saying she bought Capano a gun at his request a month earlier.