LAWRENCE, Kan. (AP) — Prosecutors are seeking to try a 17-year-old boy as an adult in the stabbing death of his grandmother.

When the teen appeared in court Wednesday, a judge scheduled a hearing for March 22 to consider the issue. The Lawrence Journal-World reports that the teen was 16 in December when police found his 67-year-old grandmother, Deborah Bretthauer, dead in the apartment they shared.

The teen has been charged with first-degree murder in juvenile court. He has pleaded not guilty to the charge and is in juvenile custody in Douglas County.

If Long is convicted of the juvenile first-degree murder charge, he could face up to 60 months in prison, or to the age of 22. In adult court, he could face more than 40 years in prison.