A woman missing for more than a month whose body was found on the porch of a vacant house in Massapequa in February died after freezing to death and the case has been closed, Nassau County police and her family said this week.

An autopsy found that Irene Luetje, 60, of North Massapequa, had an elevated level of ketones, which is often associated with diabetes, but her family said she had never been diagnosed with the illness.

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Luetje, a secretary at Farmingdale State College, was reported missing by the school after she failed to show up for work for four days.

Her family still does not know where Luetje was or what she did between Jan. 6, when she was last seen, and Feb. 16, when her body was found.

"It's still a huge mystery," her brother, Eugene Snow of Ronkonkoma, said earlier this week. "She was outside. It was cold, and she was not wearing a coat when she was found."