Amanda Gordon/Getty
January 07, 2015 03:10 PM

Thomas Gilbert Jr. looked like he had it all – but friends of the 30-year-old, who was charged yesterday with murdering his father, say he suffered from mental illness.

On Sunday, police responded to a 911 call from 20 Beekman Place in New York City, the NYPD told PEOPLE.

When they arrived, they found 70-year-old Thomas Gilbert, founder of hedge fund company Wainscott Capital Partners Fund, with a gunshot wound to the head.

Gilbert Jr., known as “Tommy,” arrived at his parents’ house around 3 p.m. and asked his mother to leave the apartment so he could speak privately to his father, New York Chief of Detectives Robert Boyce said in a press conference Monday.

The father had recently discussed no longer paying his son’s rent and also reducing his weekly allowance from $400 to $300 a week, investigators told ABC News.

Friends are saying the family dynamics were complicated.

“People are making him look like this villain who did this just because his allowance got cut,” a close friend of Tommy’s tells PEOPLE. “But that s not the case. He was a very troubled man who had been seeing a therapist for years.”

The friend describes his father as “an old school New York gentleman” who cared for his son.

“Tommy had everything you could ask for. An Ivy League education, a house in the Hamptons, memberships at exclusive clubs,” she says. “But that didn t matter because he was mentally ill.”

Thomas Gilbert

She calls Tommy a “brilliant” man.

“He is very smart, but because he was ill he didn’t have the proper tools to work,” she says. “It’s kind of like he was trapped because how was he ever going to keep up with the lifestyle he was given if he didn’t have the funds to support him?”

She also describes the family as conservative but loving.

“They were not the type of family to ask him about his anxiety, but they did want him to be happy,” she says. “He was just this nice and funny guy who was also super shy and awkward. He sometimes stuttered when he talked to people.”

Although the friend admits the younger Gilbert was supported by his family, she also adds that “he used some of that allowance money to pay for therapy.”

Legal Troubles

Things supposedly took a turn for the worse for Gilbert Jr. after this summer.

“Tommy had a restraining order filed against him by Peter Smith, who he used to be friends and roommates with,” another friend tells PEOPLE.

The order was filed on June 18, 2014, according to documents obtained by PEOPLE.

Then on Sept. 18, Gilbert Jr. was arrested on a charge of criminal contempt after he confronted Smith on a beach on Sept. 1.

Just a few days before, on Sept. 15, Smith’s house had also burned down.

Southampton Town Police said that the incident is still an ongoing investigation.

“There wasn t enough evidence to arrest him for the fire,” the friend says. “We are all shocked about what happened last weekend, but this can happen when someone is sick and doesn’t get the help they need.”

Gilbert Jr. was arraigned Monday night and charged with second-degree murder as well as weapons offenses and forgery-related offenses, according to law-enforcement officials.

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