DAILY POST had reported that the 33-year-old who was also a co-founder of ride-sharing venture "Pathao", was found dead in his Manhattan's Lower East Side apartment on Tuesday.
Police sources told ABC News on Thursday that a 21-year-old who at one point worked for Saleh was taken into custody is expected to face second-degree murder and other offenses.
It's believed that before his death Mr Saleh discovered Mr Haspil had stolen tens of thousands of dollars from him, although this was not reported to police and a repayment agreement had been organised.
The killer was said to have abandoned the scene and escaped midway into the operation when Saleh's sister showed up unexpectedly.
Surveillance footage shows the suspected killer getting on the elevator with Saleh which lets out right into his seventh-floor apartment. He used a Taser to immobilize Saleh and then stabbed him to death.
The killer's work dismembering the body was interrupted when Saleh's sister entered from the building's lobby, another official said, prompting him to flee through the apartment's back door and into a stairwell before the sister arrived.
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The team had also limited access internally to internal systems and tools during the investigation. Some experts said it seemed probable that hackers had access to Twitter's internal infrastructure.
The family released a statement Wednesday, calling the person responsible "nothing short of evil".
"Fahim is more than what you are reading", the family reportedly said.
"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".
Mr Saleh, who was born in Saudi Arabia to Bangladeshi immigrant parents, was described as a nice and loving person who loved gadgets and video games.
Mr Saleh was born in Saudi Arabia to Bangladeshi parents and grew up in NY, founded the Pathao ride company in 2015 and in 2018, the Gokada motorbike hailing app, which was extremely popular in Lagos, Nigeria, until motorcycle taxis were banned there.
Investigators had been exploring whether the killing could have been related to Saleh's business dealings.
In February, Nigerian officials began enforcing a ban on motorcycle taxis in major commercial and residential parts of the country's largest city, Lagos.