(AP) — A Lisco teen accused of helping plan a fatal attack on a western Nebraska jail guard has been scheduled for trial.

16-year-old Guy Eagle Elk appeared Friday in Scotts Bluff County District court for arraignment on a charge of aiding and abetting first-degree assault. His trial is set to begin in early July.

Eagle Elk is accused of playing a role in the Feb. 14 slaying of 24-year-old jail guard Amanda Baker on Feb. 14. Another teen, 15-year-old Dylan Cardeilhac, of Torrington, Wyo., is charged with first-degree murder.

Authorities say security video shows Cardeilhac lured Baker into his cell, pouncing on her and strangling her from behind.

Authorities say Eagle Elk told Cardeilhac how to choke the woman.

Both boys are charged as adults.