A self-proclaimed “men’s right attorney” has been identified as the primary suspect in a shooting that killed U.S. District Judge Esther Salas’ son and seriously injured her husband Sunday night.

New York attorney Roy Den Hollander, who was found dead of an apparent self-inflicted gunshot in the town of Rockland, New York, is the primary suspect, according to the FBI, the U.S. Attorney’s Office in New Jersey, and media reports.