- Why Ivins would have mailed the deadly letters from Princeton, N.J., a seven-hour round trip from his home. In perhaps the strangest explanation to emerge in the case so far, authorities said Ivins had been obsessed with the sorority Kappa Kappa Gamma for more than 30 years. The letters were sent from a mailbox down the street from the sorority's office, which is across the street from Princeton University.
Investigators can't place Ivins in Princeton but say the evidence will show he had disturbing attitudes toward women. Other haunting details about Ivins' mental health have emerged, and his therapist described him as having a history of homicidal and sociopathic thoughts.