A man is being held without bail Monday over allegations that he killed a a 49-year-old Worcester woman who worked in that city’s public school system.

The body of Sandra Hehir was found in her Congress Street apartment Feb. 5, and authorities later said she had been strangled.

Jose Melendez, 54, of Worcester, is charged with her murder, and the Worcester district attorney’s office said DNA recovered from the crime scene had connected him to the case.