A New York clothing salesman known as the “Son of Sal” serial killer was convicted on Wednesday of three counts of second-degree murder in the 2012 shooting deaths of three shopkeepers in Brooklyn, prosecutors said.

Salvatore Perrone, 67, faces a maximum prison sentence of 75 years to life for the killings of Mohamed Gebeli, 65, Isaac Kadare, 59, and Rahmatollah Vahidipour, 78, who were shot from July to November 2012.

Perrone has maintained he was framed by a business associate. His attorney could not immediately be reached for comment.