Story highlights Felicia Barahona was found with a cord around her neck

Her 4-year-old son was found dead in a bathtub

Barahona was fired in 2012 after getting pregnant by one of her students

(CNN) A 23-year-old man who as a high school student fathered a child with his teacher has been indicted on undisclosed charges related to the killing of the teacher and their son, according to a Manhattan district attorney spokesman.

The bodies of Felicia Barahona, 36, and her 4-year-old son, Miguel, were found Monday in Barahona's upper Manhattan apartment.

Barahona, unconscious and unresponsive on her living room floor, had a telephone cord wrapped around her neck. The child was discovered underwater in a bathtub. Both were pronounced dead at the scene, police said.

Isaac Duran Infante, whose relationship with Barahona five years ago while he was a student and she was a teacher led to her being fired, was arrested Tuesday.

"He admitted to us he went there because of that, to end the life of Felicia Barahona," Chief of Detectives Robert Boyce told reporters Wednesday, referring to the suspect. "While he was there he decided to kill his son as well."

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