CLAYTON, Mo. (AP) — An inmate at the St. Louis County Justice Center is dead after being found unresponsive.

The St. Louis Post-Dispatch reports that 43-year-old Bryan Peiffer was found shortly before 6 a.m. Wednesday. An autopsy performed Wednesday showed no clear cause of death. Officials are awaiting toxicology results that could take up to 12 weeks.

Pfeiffer was arrested Tuesday on a felony warrant out of Franklin County. He had been in a general holding area for several hours, awaiting extradition to Franklin County.

Paramedics tried unsuccessfully to revive Peiffer, who was pronounced dead at the scene.

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Information from: St. Louis Post-Dispatch, http://www.stltoday.com