A doctor who worked in a Bronx hospital reportedly shot seven people, killing one woman and injuring six other people before turning the gun on himself.

Dr. Henry Bello used an AR-15 assault rifle in the attack on the 16th and 17th floors of the Bronx Lebanon Hospital on Friday (June 30) at around 2:45 pm.

What’s perhaps as chilling is the email sent he sent to the New York Daily News, which blamed two doctors at the medical center for terminating his “road to a licensure to practice medicine.”

He began the letter with “First, I was told it was because I always kept to myself. Then it was because of an altercation with a nurse.” Apparently Bello had been forced to resign over sexual harassment accusations just hours before the deadly shooting. He believed his termination was over him threatening another person at his workplace.

He also reportedly sent another email to another co-worker of his before the attack “congratulating” her for his termination after she “sent out an email to everybody telling them to file complaints against me so I can be terminated for being rude to her,” he wrote. “I only said in the email, it remains to be seen if my life is meaningless or disposable.”

The Daily News says an editor at the newspaper didn’t make the Bello email connection until after the shooting. They’re also withholding the names of the two doctors Bello charged with terminating him.

Police Commissioner James O’Neill confirmed Bello died of a self-inflicted gunshot wound.

Read the letter Dr. Henry Bello sent to the New York Daily News below.