Four members of the New York Police Department have killed themselves this year. That is the same number as in all of 2018.

“Today our city is mourning the loss of another officer gone too soon,” Mayor Bill de Blasio said in a tweet Friday. “Three brave members of our police force have taken their lives in recent days. All of them led lives that made their communities better. All of their lives had meaning.”

Deputy Chief Steven J. Silks, 62, died from a self-inflicted gunshot wound on June 5, a month before his mandatory retirement. He had spent 38 years on the force and was known to be an outdoorsman, marathon runner and mountaineer.

The following day, Detective Joseph Calabrese went missing. A search party comprising helicopters, divers and 100 officers searched for Detective Calabrese, 58, after his empty vehicle was discovered beside the Belt Parkway. Detective Calabrese’s body was found near Plumb Beach. He had been on the force for 37 years.