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(Marion, IA) -- An investigation's underway after a Marion woman shows up dead at the hospital with no apparent injuries. The Linn County Sheriff's Office says the woman was dropped off at the hospital around 10:00 p.m. Wednesday, wasn't responsive or breathing, and was pronounced dead. Investigators say they believe the woman died in rural Marion but her cause of death is unclear. An autopsy will be done to determine how she died.