An upstate N.Y. man is due back in court Thursday for harrassing a relative of Brian Thompson, the UnitedHealthcare CEO allegedly murdered by Luigi Mangione.

ALBANY, N.Y. (AP) — A New York man has been charged with cyberstalking a family member of UnitedHealthcare CEO Brian Thompson, allegedly leaving threatening voicemails that expressed glee about Thompson’s killing within hours of the fatal shooting, federal prosecutors said Wednesday.

A New York man has been charged with cyberstalking a family member of UnitedHealthcare CEO Brian Thompson, federal prosecutors said Wednesday.