Peyton Hendron is charged with first-degree murder in connection with a shooting at a Tops supermarket.
Hendron appeared in court in a white robe. The public defender did not plead guilty on his behalf.
Hendron is due back in court on May 19 for a felony trial.
Ten people were killed in the shooting. Three others were injured and were expected to survive.
The FBI is investigating the shooting as an attack on racial motives and a hate crime. Authorities said 11 victims were black. The other two are white.
This story was originally told by August Erbacher wkbw.com.