The detectives, investigating the murder of Pathao Cofounder Fahim Saleh, have concluded that he was killed on Monday, the day before his body was found, reports New York Times.
They have also said that the killer returned the next day to Saleh's apartment on East Houston Street to dismember the body using electric saw and clean up the crime scene.
Detectives believe the killer's work dismembering the body was interrupted when Saleh's sister buzzed from the building's lobby, prompting him to flee through the apartment's back door and into a stairwell before the sister arrived.
Fahim Saleh was found decapitated and dismembered on Tuesday inside his luxury condo on East Houston Street.
Authorities revealed on Thursday that Saleh was stabbed to death.
On Friday, New York Police have arrested the personal assistant of Fahim Saleh as a suspect of the gruesome killing.
The 21 years old personal assistant is Tyrese Devon Haspil. He is expected to be charged in a criminal complaint with second degree murder and other crimes.