The man accused of killing two people and injuring two teenagers after opening fire inside an east Cheyenne home pleaded "not guilty" in federal court Monday.

Andrew Weaver, 25, is charged with a single count of felon in possession of a firearm.

​Weaver is accused of opening fire at 3436 E. 11th Street on Sept. 16, killing 30-year-old Shaline Wymer and 37-year-old Adrien Butler and seriously injuring two 14-year-old boys.  He's also alleged to have shot at Armando Butler, who was able to avoid being struck by a bullet by falling to the floor.​

Police say Weaver told them that he'd gone to the house with the intention of trading a gun for drugs and a different gun, and that he'd bought methamphetamine from Adrien Butler in the past.

Weaver was arrested in a nearby field a couple of hours after the shooting, and reportedly had a Smith & Wesson 9mm semiautomatic handgun on him which he said he used to shoot the victims.

U.S. District Court Judge Kelly H. Rankin scheduled Weaver's jury trial for Dec. 2 before Judge Scott W. Skavdahl in Casper, and ordered he be held in the custody of the U.S. Marshals Service until the matter is resolved.

​Weaver also has two cases pending against him in Laramie County Circuit Court -- one charging him with misdemeanor theft and misdemeanor possession of methamphetamine, and the other charging him with two counts of second-degree murder, attempted second-degree murder and two counts of aggravated assault.

When asked about Judge Thomas Lee's decision to issue a warrant for Weaver, who failed to appear on the charges Friday, Assistant U.S. Attorney Stuart Healy said he was unaware of Lee's ruling.

"Because of our writ, he was incapable of appearing in the state court," said Healy.

Healy says the U.S. Attorney's Office is "working hand-in-hand" with the Laramie County District Attorney's Office to determine whether they should take over the cases.

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