A Long Island woman found dead in her home last week was killed with an unknown chemical substance in what authorities have determined to be a homicide.

Aleena Asif, a 46-year-old Herricks resident , was found dead in her house on Larch Drive on the afternoon of Oct. 17 when cops were responding to a welfare check just before 4 p.m.

She was discovered “unconscious, not breathing and had apparent facial burns,” Nassau County police said Thursday. No one else was in the home at the time that cops arrived.

Asif was pronounced dead at the scene, about 15 miles east of Central Park. Following a subsequent autopsy, the county medical examiner ruled her cause of death was “criminal homicide due to asphyxiation by an unknown chemical substance,” according to police.

“Further testing [will

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