Alia Muslih lost her husband, a popular veterinarian, in late 2020. The Totowa Animal Hospital kept treating pets, until a dog's death exposed a fake vet scheme.
Montclair police said Amir Doctry was charged in connection with the threat. A YouTube video he posted the day before shows he hoped to be named the Montclair school district's new superintendent.
In a message on the district website interim superintendent Damen G. Cooper said the district became aware of a "potential threat" and contacted police.
Essex County Chief Assistant Prosecutor Thomas S. Fennelly told New Jersey 101.5 an officer and a civilian were taken to University Hospital in Newark following the shooting on Forest Street