Serial Killer Week is well underway on Investigation Discovery, and while the crime network is churning out new documentaries about the country’s most prolific serial killers this week, a documentary about one of the more disturbing American serial killers is set to air on Sept. 3. The new doc takes a look at the killings of Phillip Jablonski, and while he’s not as well known as the BTK Strangler or the Butcher Baker, his crimes are just as disturbing.