WORCESTER (CBS) – The man charged with murdering a Worcester teacher’s aide is in the U.S. illegally.

Immigration and Customs Enforcement has placed a detainer on 55-year-old Jose Melendez to possibly deport him.

READ MORE: Air Quality Alert Extends Into Tuesday Due To Unhealthy Levels Of Haze, Smoke In Air

Melendez pleaded not guilty this week to killing 49-year-old Sandra Hehir, a teacher’s aide at Claremont Academy Middle School in Worcester.

Prosecutors say Melendez was linked to her death after DNA evidence taken from the crime scene at Sandra’s home matched an unidentified DNA profile from an unsolved Worcester rape back in 2000.

MORE NEWS: Coronavirus In Massachusetts: Today's Developments

Prosecutors say Melendez has several aliases and long criminal record including three outstanding matters. He is due back in court on April 13th for pretrial hearing.