After confronting an officer he claims used the n-word, Dorner claims to have grabbed the officer by the throat "and squeezed, " but he writes that he regrets not doing more.

CNN: Notorious company: Dorner a 'friendly guy' gone bad

Ellen Kirschman, a psychologist, police trainer, and author of "I Love a Cop, " writes about the paradox between an officer's work life and personal life, and how police work changes people.

CNN: Cops, suicide and a father's cause

"I try to read everything he writes, " said Mohamed El-Erian, the chief executive and co-chief investment officer of Pacific Investment Management Company, the giant bond investor.

WSJ: Citi's Provocateur in Residence