(CNN) Morehouse College has placed one of its staffers on unpaid leave amid an investigation into sexual misconduct allegations leveled by at least two students and a former student, the historically black university said in statements.

Student Michael Key made his allegations public in a video on Twitter last week, saying that DeMarcus Crews -- who, according to LinkedIn, had been serving as the interim director of housing and residential education since May at the all-male school in Atlanta -- had made unwanted advances during Key's freshman year.

The episodes sent him into depression, and he shared the allegations with only a few friends, he said.

"I just started breaking down crying today," Key said in the video.

A man answering Crews' phone told CNN that Crews wasn't taking calls. Crews' LinkedIn profile says he graduated from Morehouse in 2015 and began working for the university the same year.

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