Fahim Saleh, a tech entrepreneur and the son of Bangladeshi immigrants.

He was killed after receiving multiple stab wounds to his neck and torso, in the living room of his luxury $2 million condo on the Lower East Side, a neighborhood in the southeastern part of the New York City borough of Manhattan

The culprit was said to be his 21-year-old executive assistant.

Accused of decapitating and dismembering his boss after assaulting him with a Taser, he pleaded not guilty to a second-degree murder, his attorneys said.

Tyrese Devon Haspil who is a native New Yorker, handled Saleh's finances and personal matters. He was in his late teens when the entrepreneur hired him, according to a law enforcement official with knowledge of the investigation.

He had no prior contact with the criminal justice system before his alleged involvement in the gruesome murder, said Sam Roberts and Neville Mitchell, the Legal Aid Society attorneys with the Homicide Defense Task Force.

Saleh's body was first found by his sister who had gone to check on him, one day after his death, after Saleh's neighbor contacted her after hearing screams the night before.

At that time, Haspil was intending to dispose of Saleh's butchered body and clean the gore. The suspect fled just in time when Saleh's headless and lifeless body was found.

Saleh was last seen in surveillance video when he got into an elevator with a masked man dressed in all black three-piece suit with latex gloves, according to a law enforcement official.

The suspicious man also carried a duffel bag, a security video showed.

The authorities believe that it was Saleh's assistant Haspil who entered the elevator with him, considering that the elevator the two were in, is a key-secured private elevator that goes straight into Saleh's apartment unit on the seventh floor.

In other words, Saleh must have known this person.

Investigation led to a video from a Manhattan hardware store on Tuesday morning that captured Haspil purchasing an electric saw and some cleaning supplies.

The investigators theorized that Haspil had tried to make the killing look like a professional assassination to divert attention from himself.

Haspil however, left behind clues: he used a credit card to purchase the items at a Home Depot. And a Taser prong that was recovered from Saleh’s body bore a serial number connecting Hasil to the murder, sources indicated.

According to three officials who briefed on the matter, Haspil had stolen roughly $90,000 from Saleh.

Saleh, who friends said was a generous man, fired Haspil because of this, but didn't report the theft. He even offered a way for his former employee to work off his debt in what amounted to a payment plan.

Fahim Saleh was born in Saudi Arabia to Bangladeshi parents. He grew up in upstate New York, and had a computer science degree from Bentley University in Massachusetts.

Saleh was only a boy when he built his first website called Salehfamily.com. Growing up, Saleh was known to sit at his home in his pajamas creating websites with ads that generated revenue.

It was then In his teens and while at Bentley, that Saleh developed and sold websites that catered to young people.

"I would stay up super late ... and would be worried my Dad would catch me," Saleh once said. "He thought it would hinder my schoolwork, which it didn't. Then, I got my first paycheck from Google for $500 as a teenager and showed it to my Dad. He was like, 'Okay, let's open an account.'"

Saleh was known to have helped the launch of the Bangladeshi ride-sharing start-up Pathao, and the motorbike-hailing app in Nigeria called Gokada. As a tech entrepreneur, he also founded PrankDial.com, a website for prerecorded prank phone calls that generated over $10 million since its start.

More recently, the frequent Medium blogger also founded the Manhattan venture capital firm Adventure Capital.

"The Fahim Saleh that a lot of people here knew was a doer, really. A builder. Most entrepreneurs come up with ideas. He put his money where his mouth was. He backed people with both money and advice and made things happen," said Ahmed Fahad, the VP of Pathao.

Hussain M. Elius, a co-founder and CEO of Pathao, said that Saleh "believed in the potential for technology to transform lives in Bangladesh and beyond."

"He saw the promise in us when all we had was a common purpose and a shared vision."

"The headlines talk about a crime we still cannot fathom," said his family in a statement this week.

"Fahim is more than what you are reading. He is so much more. His brilliant and innovative mind took everyone who was a part of his world on a journey and he made sure never to leave anyone behind."

Saleh was 33 years old, and his death caused shock and sympathy from the tech community.