A Long Island medical technician mysteriously died from a disease he may have caught while on the job, officials said yesterday.

Steven Linzer, 45, an employee of Nassau County, died last Wednesday, and police are treating it as a line-of-duty death.

Officials haven’t disclosed the disease that killed Linzer, who lived in Levittown.

The county medical examiner will determine the cause of death.

A county Health Department spokeswoman told Newsday that the agency’s infectious-disease specialists are not investigating.

Linzer’s widow, Irene Linzer, told the paper he was a “very caring and loving person. He was a very family-oriented person.”