The man accused of fatally stabbing a 14-year-old boy in the Bronx late last week has pleaded not guilty to murder, among other charges.

The man accused of randomly stabbing a Bronx teen to death threatened to snap the necks of court officials and screamed he was “with Satan” during his Sunday murder arraignment. “My name is Waldo Mejia,

The Bronx man accused by police of stabbing a 14-year-old to death in an unprovoked attack suffered from schizophrenia and refused attempts to get him necessary medication and hospitalization, according to the man's stepbrother.

Suspect Waldo Mejia’s neighbor was afraid to leave home without first checking their Ring doorbell to make sure Mejia wasn’t around.

Caleb Rios, whom authorities say was fatally stricken in the chest on East 138th Street Friday (Jan. 10) morning as he walked to school in the Bronx, per The New York Post. However, Mejia was in court to face charges in connection to another stabbing of a 38-year-old man who survived his injuries,