Following info. from the Baltimore Sun website...[not a verbatim report]
2005-2006 -- Baltimore Police return a batch of defective .40 cal. Glock pistols to the Glock company, including one with the serial number EKG463US which would eventually be used in the 2008 Weleetka, Oklahoma murders.
2006-- Glock repairs the guns and sells them, including the murder weapon to a dealer in Oklahoma.
Fall of 2007--Kevin Joe Sweat buys a .40 cal. Glock handgun from a gun store.
June 8, 2008--Taylor Paschal Placker, 13, and Skyla Jade Whitaker, 11, are fatally shot along a dirt road near Weleetka, Oklahoma. Police find 5 spent .40 cal. shell casings at the scene.
January 2010-- Sweat tells OSBI Agents that he sold the gun and does not know the serial number.
August 15, 2011---Sweat is arrested and charged with killing his fiancee'.
August 22, 2010-- Agents search the home [property] of Sweat's father and recover several .40 cal. shell casings.
September 30, 2011-- FBI investigators trace the casings to the Baltimore Police Department.
October 5, 2011--FBI confirms that the shell casings found on Sweat's father's property and the 5 casings at the murder scene are from the Glock 22 serial number EKG463US.
Sept. 13, 2011--Court documents indicate that Sweat confesses to killing the two girls near Weleetka.
Dec. 9, 2011--Authorities charge Sweat with two counts of first degree murder and announce plans to seek the death penalty.
Dec, 2011--Authorities in Oklahoma claim that Sweat may have tried to sell the Glock 22 at a Tulsa gun show.