Authorities say the .44 caliber handgun used by Charles Lee "Cookie" Thornton to kill Kirkwood, Mo., police Sgt. William Biggs may have been stolen. After killing Biggs, Thornton took the officer's .40 S&W duty weapon and used both to open fire on the St. Louis suburb's city council. Four people, including another officer, were killed in the Feb. 7 shooting before Thornton was shot and killed by police.
Investigators say that Thornton's .44 was stolen in nearby Franklin County in 1994 or 1995. How Thornton acquired the weapon is not known.

