Virginia State Police are investigating the death of a man who collapsed in the back of a squad car.

Christiansburg town spokeswoman Melissa Powell said police arrested 59-year-old Leonard J. Karr without incident Monday afternoon after he was reportedly acting strangely outside the Microtel Inn & Suites.

Her statement says he was arrested on a probation violation without any use of force and put in handcuffs in the squad car.

Powell says that the officer said Karr appeared to be "in distress" when they arrived at the magistrate's office 17 minutes later. He was unresponsive by the time rescue personnel arrived, and died at a hospital Monday evening.

Police have released no more details, and the cause of death was not immediately clear.