A recording of a 911 call made by a woman who found her husband fatally shot in their Upper East Side home was played in a Manhattan courtroom on Tuesday, as her son is tried on murder charges.

The New York Daily News reports that Shelley Gilbert’s chilling 911 call — made in January 2015, after she found her husband shot in their luxury Manhattan home — was played for jurors on Tuesday at the trial for Thomas Gilbert Jr., accused of murdering his father Thomas Gilbert, Sr. in cold blood, over a dispute involving the weekly allowance for the now-34-year-old suspect.

The elder Thomas Gilbert, a wealthy hedge fund founder, had reportedly cut his son’s allowance from $1,000 a week to $300 weekly. According to the New York Times, Shelley Gilbert said in court that the parents had made the decision in order to convince their son to seek help at a psychiatric hospital, as they felt his condition was too severe to be managed by the treatments he was receiving at the time.

But the 911 recording, shared in full by the Daily News, shows that the defendant’s mother believed even she had underestimated the problem.

When asked who shot her husband, Gilbert says: “My son, who is nuts … But I didn’t know he was this nuts.”

As the recording shows, 911 dispatchers did not know immediately that Mr. Gilbert had been shot, until Shelley Gilbert says so later in the call, as she is being instructed to give her husband chest compressions.

“I can see he’s dead,” Gilbert says on the 911 call.

According to the New York Post, Shelley Gilbert is the prosecution’s key witness, but did not volunteer to testify against her son; instead she was called to testify through a subpoena.

Further, the New York Post reports that the grieving widow is expected to ask that her son receive psychiatric treatment instead of prison time if he is convicted.

According to the New York Times, the defendant’s legal team tried to argue that Thomas Gilbert, Jr., was unfit for trial due to his mental illness, but the motion was not successful.

The Princeton graduate has been dubbed the “Ivy League Killer.”

According to the Indy East End, Gilbert had run into trouble with the law in the past, and was accused of violating a restraining order in 2014.

Related Podcast: