(CNN) Detroit police have taken a man into custody in connection with an investigation into a possible serial killer and rapist.

The man was taken into custody at a bus stop at 7:30 p.m. ET, police said.

Police have not said why the man is a person of interest. CNN is not identifying the man because he has not been charged.

The investigation stems from the deaths of three women that appear to be connected, Detroit Police Chief James Craig said during a media briefing Wednesday.

Police opened an investigation after discovering a partially dressed, deceased woman in a vacant building on March 19, Craig said. Investigators first believed that the woman had died of a drug overdose, but a medical examiner ruled that she died of blunt force trauma, he said.

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