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LOWER EAST SIDE, Manhattan — UPDATE: A personal assistant for the Lower East Side man found decapitated has been taken into police custody, a law enforcement source said.

Original story:
Police have identified a person of interest in the death of a Lower East Side man found decapitated and dismembered inside a luxury condo, police sources told PIX11 News.

Fahim Saleh, 33, was found dead inside his Manhattan residence on Tuesday.

The city’s medical examiner said Saleh’s cause of death was multiple stab wounds to the neck and torso, and was ruled a homicide.

Saleh’s cousin made the grisly discovered Tuesday afternoon. He had been unresponsive to text messages from a family member and missed a work-related conference call that same morning.

Surveillance footage shows Saleh coming home from a jog where he was followed into his elevator by a man dressed all in black, according to police sources.

It’s believed the suspect attacked Saleh when the elevator opened up into his 7th-floor unit. An electric chain saw was left plugged into the wall, police sources said.

Saleh, the son of two Bangladeshi immigrants, created a tech empire and founded a number of startups. Those who knew him said he had a heart of gold.

Thursday, Saleh’s family asked for privacy, struggling to deal with their loss.

The family released a statement Wednesday, calling the person responsible “nothing short of evil.”

Editor’s note: Sources initially told PIX11 there was a person in custody in the killing, but a police spokesperson has since told PIX11 this is not true.