Patricia Columbo and Frank DeLuca are arrested for the brutal slaying of Columbo's parents and brother in Elk Grove, Illinois. Twenty-year-old Columbo had left her family home two years earlier to live with DeLuca, a 36-year-old married man. The pair later killed Frank, Mary, and Michael Columbo in order to receive the family inheritance, unaware that the Columbos had written Patricia out of their wills years earlier.

As a 16-year-old, Columbo worked in a suburban coffee shop where she met pharmacist Frank DeLuca, who managed the pharmacy next door. He soon hired her to work in his store and the two began an unusual sexual relationship; Columbo showed classmates pictures of her having sex with DeLuca's dog. In April 1974, DeLuca brought Columbo to stay in his own home, despite the fact that he still lived with his wife and five kids. Her parents were relieved when she later told them she was going to move into her own apartment, and even provided her with money. However, they soon learned that DeLuca had left his wife and moved in with their daughter, prompting Columbo's father to beat DeLuca severely.

On May 4, 1976, Patricia Columbo, then 19, and Frank DeLuca, 39, decided to carry out the plan themselves. They crept into the Columbo family home and shot Columbo's parents. They then bludgeoned Mike with a bowling trophy and stabbed him nearly 100 times with scissors. Police questioned Patricia but had no reason to suspect her until the following week.

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