GERING, Neb. (AP) — A trial is beginning for a Nebraska teenager accused of helping plot a fatal attack on a Scotts Bluff County corrections officer.

Seventeen-year-old Guy Eagle Elk, of Lisco, has been charged as an adult with felony aiding and abetting assault in the Feb. 14, 2014, death of jail guard Amanda Baker. A jury was selected on Monday and is scheduled to hear testimony Tuesday in the trial in Scotts Bluff County District Court in Gering.

Eagle Elk is accused of showing 16-year-old Dylan Cardeilhac, of Torrington, Wyoming, how to strangle Baker.

Cardeilhac has been convicted in Baker’s death and has been sentenced to 60 years to life in prison.