William Spengler, who shot and killed two Rochester-area firefighters, was convicted of killing grandmother in 1981

Posted at 2:45 PM, Dec 24, 2012
and last updated 2012-12-24 14:45:30-05

(CNN) — The suspect in the shooting deaths of two firefighters in upstate New York Monday is William Spengler, 62, who was convicted in 1981 of first-degree manslaughter for killing his grandmother, Webster Police Chief Gerald Pickering said. Authorities do not know how Spengler, who died of a self-inflicted gunshot wound, obtained the weapon he used in Monday’s shooting or why he opened fire, Pickering said.