SHOCK: Amy Bishop had killed before

AP: An Alabama university professor accused of fatally shooting three colleagues at a faculty meeting this week shot her younger brother dead at their home in the Boston suburbs more than 20 years ago, but records of it are missing, police said Saturday.

Amy Bishop shot her teenage brother in the chest in 1986, Braintree police Chief Paul Frazier said at a news conference. She fired at least three shots, hitting her brother once and hitting her bedroom wall, before police took her into custody at gunpoint, he said. (read the entire report embedded below)