TRENTON, N.J. (AP) — A recently uncovered Google search for murder methods was a key factor in a New Jersey man’s decision to plead guilty this week to killing his mistress, his lawyer says.

Rosario DiGirolamo faces a 25-year prison sentence after admitting to killing 27-year-old Amy Giordano of Hightstown in June 2007 and dumping her dismembered body in a New York pond.

The Times of Trenton reports newly discovered evidence that DiGirolamo had done a Google search of the phrase “lethal karate blows to the back of the head” days before the killing convinced him to take a plea deal.

Defense attorney Jerome Ballarotto says the Google search evidence was “catastrophic.”

DiGirolamo left the couple’s 11-month-old son in the parking lot of a Delaware hospital.

(Copyright 2011 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)

More From CBS New York

Download Weather App
Bloomberg WCBS Tri-State Business Index

Watch & Listen LIVE