Some shootings at post offices: Jan. 30, 2006 — A female ex-postal worker opens fire at a mail processing plant near Santa Barbara, Calif., killing six people before committing suicide, authorities say. April 17, 1998 — Maceo Yarbough III, a 27-year-old letter carrier, fatally shoots a post office clerk in Dallas after they argue in a break room. He is found not guilty of murder by reason of insanity. Dec. 19, 1997 — Postal employee Anthony Deculit, 37, kills... (GunPolicy.org)