I'll Be Back, Mister Barreli

Letter was dropped at the crime scene on april seventeenth. Six weeks later, another letter was received by jimmy brelan a famous columnist for newsday. The author expresses ambivolence and both does and does not want to kill. He says he's driven to kill them by a figure named sam. Sam is said to be a father as someone who old and has had multiple heart attacks. Writer commands the author to go and kill on his behalf, to provide blood for papa.