LIMA — A 17-year-old teen became the first juvenile to be indicted as an adult Thursday in the summer slaying of another teen.Ritchie R. Johnson was indicted on the charge of complicity to murder. He is the first teen bound over to be tried as an adult. Prosecutors also are seeking to try the accused triggerman, Dederick Matthews Jr., now 15, and Devontae Upshaw, 15, as adults.Johnson’s arraignment is scheduled for Monday in Allen County Common Pleas Court.Meanwhile, the only adult charged in the case, Xavier Arrick, 19, was given a new trial date of May 9. Arrick was the only teen who was an adult at the time of the Aug. 30 slaying of 16-year-old Eric Armstead. Armstead was shot in the head while he sat on a porch at 620 Madison Ave.Prosecutors said the group of five teens were involved in an ongoing dispute with Armstead and his group, which led to the shooting. The group drove to the scene with Upshaw and Matthews getting out of the car to shoot at the house where Armstead was on the porch. A prosecutor said the shot came from a long distance and called it a lucky shot.Arrick has agreed to cooperate and testify against the co-defendants. He is charged with murder, but that is expected to change providing he holds up his end of the bargain and testifies.Co-defendant Shaquille Bulls, 16, also has reached a deal with prosecutors to testify against co-defendants in exchange for his case remaining in Juvenile Court on a lesser charge.Matthews’ case remains pending in Juvenile Court. Judge Glenn Derryberry heard testimony on Matthews’ psychological state Wednesday as well as other issues concerning him. Derryberry must decide whether Matthews stands a chance at being rehabilitated in the juvenile justice system. If Derryberry rules against him, he will be tried as an adult, facing up to life in prison.Derryberry also takes into consideration Matthews’ emotional, physical and psychological maturity, as well as any previous involvement in Juvenile Court and how he responded following that involvement.You can comment on this story at www.limaohio.com.