According to his company profile, over his 20-year career, Jules, 61, had been involved in transactions totalling more than $45 million (£35 million).

Robin, 58, was an esteemed paediatrician, who was compassionate and driven to save lives.

She had a smile for everyone and when Robin wasn’t devotedly caring for her patients, she took junior doctors under her wing and passed on her wisdom.

Their success gave Jules and Robin a very comfortable life. They lived in a multi-million-dollar house in an affluent area of Scarsdale, New York, complete with a swimming pool and over an acre of land.

They were active in the Jewish community and well-regarded on the social scene, but for Robin, her real passion was being a mum to their three grown-up children, all in their 20s.

And now grandchildren were on the scene, she was besotted. No matter what pressures her job brought, or what hours she had to work, Robin was always there for them.

But things had not been so happy at home, and in August 2015 Jules filed for divorce, and Robin agreed. They separated, and Jules split his time between the couple’s family home and an apartment he had in Manhattan.

But in January 2016, Robin changed the locks in the family home. Had their seemingly amicable separation turned sour? Why was Robin trying to keep Jules out?

On the morning of January 20, Robin was home alone. She was five days away from having the first court proceeding for the upcoming divorce.

Getting ready for work, Robin got into her shower upstairs. What she didn’t know was that Jules had made his way to the house and somehow managed to enter the property.

The noise of running water would have masked the sound of Jules climbing the stairs – and it would have been inconceivable to Robin that he was heading her way clutching an 8-inch kitchen knife.

Attacking his wife from behind as she was in the shower, Jules brutally stabbed Robin 22 times. The blade sank into her hands, chest, abdomen and back, puncturing her lung, heart, liver and kidneys. Robin fought back bravely with the hands that had healed so many across her notable career. She left marks on Jules, including a black eye, but she couldn’t overpower him and sank to the base of the shower, bleeding profusely.

Jules had never shown any violence in his lifetime and yet there he was, in their luxury home with a bloody knife in his hand. Leaving his wife fatally wounded, Jules walked downstairs and hid the weapon in a folded newspaper.

Then he lit up a cigarette and smoked it while Robin was bleeding to death upstairs. It’s not known how long he waited – it could have been anything up to two hours, but finally, around 10am, Jules called 911 to report that his wife was ‘seriously injured’.

Killer lit a cigarette and smoked it while Robin was bleeding to death upstairs

Officers at the scene noted that although Jules claimed to be grieving, he was in an oddly ‘joking mood’.

After asking them if he’d be able to attend his wife’s funeral, and whether he could have his anti-anxiety medication, he then asked them about their opinions on the then-presidential candidates, Donald Trump and Hillary Clinton.

When an officer gave him orders he responded, ‘You’re not my boyfriend you know.’ When the officer remained silent, Jules commented, ‘What? You guys can’t take a joke?’

While Jules was being questioned by police, word of the murder spread around the exclusive community, and the shock was palpable.

The last recorded murder in Scarsdale was almost three decades earlier, in 1977 when Richard Herrin, 23, killed ex-girlfriend Bonnie Garland, 20, smashing her head with a hammer as she slept in her parents’ home.

The authorities were quick to reassure the public that they already had their killer. ‘This is not a random act, this was an isolated incident,’ the police said. Jules was arrested. For his mug shot, he wore makeshift ear plugs without explanation.

A day after the stabbing, in keeping with the Jewish religion, Robin was buried. Hundreds of mourners came to pay tribute to the woman who had saved lives and loved her family. Jules wasn’t spoken of, only Robin’s achievements and how much she would be deeply missed by everyone.

At first, Jules was charged with second-degree murder and he pleaded not guilty.

A judge denied him the chance of bail due to his extensive connections and his access to money, raising the risk that he could flee. The judge also granted a request from his three children to instruct an order of protection against him.

They disowned him and made it clear they feared any future violence from him.