The man who heads up the Detroit police's Homeland Security department is set to appear in a cable television documentary about a serial killer case he investigated a decade ago.
Inspector Donald E. Johnson Jr. is to be featured Thursday in "Very Bad Men" on the Investigation Discovery channel.
The documentary is about John Eric Armstrong, a former Navy sailor who's serving a life sentence in five prostitute slayings.
At the time of the investigation into the killings in 2000, Johnson was a Detroit police officer assigned to the Violent Crimes Task Force.
Detroit police say that once Armstrong was apprehended, Johnson and another task force member conducted the interrogation in which Armstrong confessed to the deaths and was charged.
Armstrong strangled his victims after having sex with them.