for 26 years he and his wife had lived on this street in teaneck.ised their two daughters here. now, investigators had to figure out who wanted him dead. >> it wasn't just a shooting, it was an execution. he shot him from behind execution style. >> diabolical? >>> yeah, despicable. >> reporter: back at the scene of the fire, investigators found a bullet casing for a .380 caliber handgun. an analysis of a comforter also found in that bedroom revealed something else. >> and the forensic scientist was able to determine that ethanol was on the comforter. >> reporter: that suggested an accelerant had been used to set rob's body on fire. for bergen county prosecutor john molinelli, that was a disturbing development. that's because this was now the arson homicide in bergen county in less than a year. >> are those other two murders the first thing that come to your mind when you see this crime scene? >> there was certainly a discussion and a deliberation on the topic, certainly within the first few weeks of the cantor murder. >> reporter: on the surface, th