Prof Reazul Haque of the Department of Development Studies at Dhaka University has sent a legal notice to the administration challenging his suspension.
He called his suspension order illegal in the notice sent on Tuesday through Supreme Court lawyer Jyotirmoy Barua.
"The university authorities suspended him without adhering to the rules. Prof Reaz was not informed why he was facing punishment," Jyotirmoy said.
Prof Reaz was suspended by the university’s Syndicate on February 27 for showing "obscene materials" during the women and development course in an evening Master’s batch, where the students are all officials of Bangladesh Bank.
A five-member investigation body, headed by Pro-VC (education) Prof Nasreen Ahmed, was formed to look into the matter.
DU teacher suspended for showing ‘obscene materials’ in class
Was DU teacher Reaz subjected to office politics?
It was later learnt that the teacher was a victim of conspiracy by some students and teachers of the same department.
Prof Reaz said: "I took this course in several other batches. The students who complained against me to the department’s chairman did not raise any question when I took the classes [before December] or checked the exam scripts."
When asked, chairman of the department Prof Md Abu Yousuf said: "We had asked him to change the subject after students objected in their course evaluation paper."
Prof Yousuf said that Prof Reaz had not been formally asked to change the contents. "We asked him to do so over phone."