A Florida college professor fired after he allegedly harassed one of the victims of the 2012 school shooting in Newtown, Conn., is suing the school for wrongful termination and violation of his right to free speech, according to the Palm Beach Post.

James Tracy was fired by Florida Atlantic University in January. The college did not say in its press release announcing his termination from the School of Communication and Multimedia Studies why it was firing him.

The parents of one student killed at Sandy Hook recently claimed in a Florida newspaper opinion piece that Tracy was taunting them. The parents of 6-year-old victim Noah Pozner say Tracy harassed them, demanding proof their son existed, according to CBS Miami.

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Tracy was reprimanded in 2013 for writing in his blog that the Sandy Hook killing was staged, and he has questioned accounts of other mass slayings.