NEW YORK — As Deloris Gillespie went up the elevator to her fifth-floor Brooklyn apartment, carrying groceries, her killer was waiting. Though no one may have seen him, he had been in the building long enough for neighbors to have smelled something odd.

Surveillance video from inside the small elevator shows that he looked something like an exterminator, with a canister sprayer, white gloves and a dust mask, which was perched atop his head like a pair of sunglasses. The sprayer was full of flammable liquid.

Additional Photos

Jerome Isaac sits in a police car after being led out of the 77th Precinct in Brooklyn, N.Y., on Sunday, following his arrest in the death of 73-year-old Deloris Gillespie. Isaac told police he set Gillespie on fire in an elevator because she owed him $2,000, authorities said Sunday. The Associated Press

When the elevator opened Saturday afternoon, the man sprayed the 73-year-old woman, who turned around and crouched down to try to protect herself, New York Police Department spokesman Paul Browne said.

The attacker sprayed Gillespie in the face and continued to spray her “sort of methodically” over her head and parts of her body as her bags of groceries draped off her arms, Browne said.

Then, Browne said, the attacker pulled out a barbecue-style lighter and used it to ignite a rag in a bottle. He waited a few seconds as Gillespie huddled on the floor. Then he backed out of the elevator and tossed in the flaming bottle.

Neighbors in the Prospect Heights building quickly reported a fire, but had no idea that a woman was being burned alive.

Overnight, a 47-year-old man smelling of gasoline went into a police station and implicated himself in Gillespie’s death, Browne said. The suspect, Jerome Isaac, told police he set her on fire because she owed him $2,000 for some work he had done for her, Browne said.

Jaime Holguin, who lives on the same floor as Gillespie, saw surveillance pictures of the attacker and said, “Oh, my God!”

Holguin, the manager of news development for The Associated Press, said the attacker looked like a man who lived with Gillespie for about six months last year and appeared to have been helping her out.

That arrangement apparently ended by early 2011, but months later Holguin started seeing the man nearby on the street, looking “a lot more disheveled.”

Browne said that after setting Gillespie ablaze, Isaac set another fire at his own apartment building nearby, then hid on a roof before turning himself in to police.

Isaac was arrested Sunday on murder and arson charges. The Brooklyn district attorney’s office had no information on whether he had an attorney.

Residents were evacuated and kept away from the six-story building for hours Saturday night as police investigated. On Sunday, Holguin said, the fifth floor was a mess, with a melted elevator door and a layer of water on the floor.

Holguin said he and his girlfriend had taken the elevator on their way out of the building shortly before the attack. They didn’t see anyone on the floor with them but did notice an odd smell, as if someone was painting, he said.

Holguin said police told them later that the assailant was already in the building and perhaps had hidden on another floor when they left their apartment.

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