TULSA, Oklahoma - Two east Texas teenagers charged with fatally shooting the grandmother of one of the teens signed a waiver of extradition Monday afternoon in Tulsa. 

According to the Paris News, Christian Sims, 16, and his girlfriend, Ashley Morrison, 17, will be back in Lamar County Tuesday. 

The newspaper reports preliminary autopsy results, released Monday by the sheriff's office, show 66-year-old Annie Sims of Paris, Texas died of multiple gunshot wounds.

Using credit card activity, Lamar County authorities tracked Sims and Morrison to a Sapulpa motel on December 18, 2014, where Sapulpa Police arrested them on December 18, 2014.