Toby is the Scranton Strangler. There are several fan theories that Toby was the real Scranton Strangler with the most common theory believing Pam’s rejection caused Toby’s transition from frustrated HR rep to a homicidal maniac. Add in Michael’s constant torture and several easter eggs this theory is one of the biggest theories. Check out this Reddit Fan theory as to Toby’s motives to kill. Click Here. Also in true Office fashion, every cast member of the show is verified except Paul Lieberstein, the actor who played Toby.