An elderly man from Queens was killed in a fire that tore through his home in a posh Long Island hamlet Tuesday night — and the case is being investigated by homicide detectives, police said Wednesday.

Authorities responded to the inferno at the single-family home at 300 Centre Island Rd. in the town of Oyster Bay shortly after 10 p.m., according to the Nassau County Police Department.

Investigators found the “severely burned” body of a man in his 70s near the front door, police said.

The victim’s identity was not immediately released.

The $2.4 million, 2,200-square-foot, three-bedroom home was “engulfed in flames,” the spokeswoman added.

The blaze was extinguished after several hours with the help of multiple Long Island fire departments.

Sources told News 12 Long Island that the fire appears to be suspicious, but Nassau Police Detective. Lt. Stephen Fitzpatrick said Wednesday that it remains undetermined.

The intensity of the fire is what’s concerning to us,” Fitzpatrick told reporters. “We don’t know what’s the source of that fire. It’s not in the area of the house such as a kitchen that would be able to fuel the fire and make it that intense.”

Authorities believe the victim was from Queens who was one of several family members who occasionally used the house, Newsday reported.

The Fire Marshal will determine the cause of the fire.

Arson and homicide squads were investigating the incident.

The Long Island fire comes after a man, his wife and their two kids were found dead at the family’s burning New Jersey mansion Tuesday afternoon.

Keith Caneiro’s body was found with a gunshot wound outside the $1.5 million, five-bedroom home while his wife and their children were pulled from the rubble inside.

Caneiro’s brother, Paul Caneiro, was arrested Wednesday for aggravated arson in connection with a fire that tore through his own Ocean Township home earlier in the day Tuesday, authorities said.