Salvatore Perrone, the 63-year-old Staten Island man suspected since last month in three Brooklyn murders [/blog/crime/salvatore-perrone-63-charged-with-murdering-3-shopkeepers] including most recently a killing on Flatbush Avenue [/blog/crime/78-year-old-man-fatally-shot-on-flatbush-ave], has pleaded not guilty to six counts of murder, reports [http://www.ny1.com/content/top_stories/173839/man-pleads-not-guilty-in-brooklyn-shopkeeper-slayings] NY1. Perrone