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HAMILTON HEIGHTS, Manhattan — A Pennsylvania man has been charged with murder in connection with the deaths of a mother and her 4-year-old son whose bodies were found in their Hamilton Heights apartment the day after Christmas.

Isaac Duran Infante, 23, faces two counts each of first-degree murder and second-degree murder in the case.

He was arraigned Wednesday.

Felicia Barahona and her son Miguel Barahona were found dead on Monday in their apartment on W. 153rd Street near Broadway.

The 36-year-old mother was found dead in the living room with an electrical cord wrapped around her neck, police said. The child was found submerged in a bathtub.

Her cause of death is ligature strangulation and the child’s cause of death is asphyxia due to neck compression. Both were determined to be homicide, according to the medical examiner.

A law enforcement source told PIX11 News Barahona used to be a teacher at Clinton DeWitt High School in the Bronx but was fired after having a sexual relationship with a student.

The Associated Press reports the suspect, Infante, is the father of the slain child and Barahona’s former student.

A 2012 report by school investigators found Barahona and Infante began a sexual relationship when the student turned 18, the Associated Press reports.

That report found that Barahona believed she and Infante would get married before their relationship ended, according to the AP.