After a three-month investigation, officials could not determine the cause of the Jan. 21 fire that destroyed a home in Poughkeepsie, N.Y., and killed three people including Kevin Johnson, 21, of New Canaan.

The Fairview Fire District, Poughkeepsie Police Department, Dutchess County Department of Emergency Response and Arlington Fire District all participated in the joint investigation.

Beyond listing the cause as undetermined, the joint statement revealed the fire originated in the rear first floor portion of the home. The investigation eliminated the following possible causes for the fire: heating systems; spontaneous ignition; portable heating units; lighting; cooking equipment; and solar energy.

However, the investigation also concluded "that smoking materials, electrical distribution, electrical devices and human behavior could not be eliminated as potential causes."

Johnson, a Dutchess Community College student, was a 2008 New Canaan High School graduate. He and Eva Block, a 21-year-old Marist student from Woodbridge, and Kerry Fitzsimons, of Commack, N.Y., perished in the fire.

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About 400 friends, family and acquaintances gathered at St. Aloysius Church in New Canaan to pay their final respects to Johnson at his funeral in January.

Johnson was remembered as a caring son and faithful friend who, in the words of his father, Steve Johnson, started life in high gear and "did not look back from the first moment to the last."