A black Staten Island teen suffered a fatal asthma attack last week while being chased by a group of white and Hispanic men — and now investigators are looking into whether he was the victim of a hate crime, police sources said.

Dayshen McKenzie, 16, keeled over in a back yard on Spartan Avenue near Rosecliff Road in Mariners Harbor about 4:15 p.m. May 27, and died less than two hours later at Richmond University Medical Center.

The teen had been trying to evade a group of men — one of them possibly armed with a firearm — who gave chase following an earlier dispute, police sources said.

After the initial investigation, there was nothing to indicate McKenzie was being chased because of his race, police sources said.

But an alleged witness, identified as ex-cop Diane Fatigati, has given conflicting accounts of what happened, according to police sources. Police sources say when first questioned, she made no mention of any racial elements. Later, she said in a published report that she heard one of the pursuers use the word “n—–.”

Law enforcement sources said hate crime investigators will take another look and reinterview witnesses to determine if that was the case.

“There was nothing at the time of the investigation to corroborate the story. There was nothing there,” a police source said about the hate-crime allegation. “No one mentioned it during the initial interviews.”

In 1999, Fatigati allegedly broke into her lesbian ex-lover’s Queens house, where she attacked the woman and her new boyfriend, according to a published report.

According to authorities, the then-scorned cop also fondled her ex’s breasts.

She was charged with sexual abuse, harassment, aggravated harassment and criminal trespass. The disposition of the case was not immediately clear.

Fatigati worked at Manhattan Criminal Court from 1991 to 2001, sources said.