The suspect was dressed in a black 3-piece match and wore a black mask and latex gloves, the officials stated. He was carrying a duffel bag.

As the two men remaining the elevator, which opened right into Mr. Saleh’s seventh-floor unit, the assailant fired a Taser into Mr. Saleh’s back again, immobilizing him, at about 1:44 p.m. on Monday, according to a legal grievance. He then stabbed Mr. Saleh to death, wounding him many periods in his neck and torso.

The next early morning, Mr. Haspil utilized a credit card to seek the services of a motor vehicle to go to a House Depot, on West 23rd Avenue in Manhattan, and to buy an electric powered observed and cleaning provides, the fourth official claimed. The felony grievance reported he was captured on movie by a retailer digicam purchasing the products at 9:30 a.m.

Later on that working day, dressed in a grey hooded sweatshirt, the assailant returned to Mr. Saleh’s apartment to dismember the physique and clean up the criminal offense scene.

Security video from inside Mr. Saleh’s elevator confirmed that the suspect employed a moveable vacuum cleaner, maybe in an effort to get rid of residue that was still left at the rear of when the Taser was fired, the officials said.

But while the assailant was chopping up the physique, Mr. Saleh’s cousin buzzed the apartment from the building’s lobby. Prior to she obtained upstairs, the attacker fled by means of a back doorway and down a stairwell, officials stated.

Only 4 several years back, Mr. Haspil graduated from Central Superior University in Valley Stream, N.Y., in which he received an award for web site structure, according to nearby information posts. In 2017, he entered Hofstra as a member of its class of 2021.