Scottsdale police officers arrested a suspect Tuesday accused of robbing and kidnapping a 94-year-old woman last week from her home and leaving her in the trunk of her car.

Ian Michael Nielsen, 25, faces charges of attempted second-degree murder, assault and kidnapping, among others, police said.

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The woman eventually was able to free herself from zip-ties he he tied around her hands and get out of the trunk after about six hours, police said. She had been left near her home at Scottsdale Fashion Square mall.

She was hospitalized with a broken sternum but has since been released.

Detectives have found no evidence that Nielsen had a weapon on him during the kidnapping. He admitted to the assault and kidnapping during an interview with investigators.

Police said Nielsen was renting a home in the area and was in search of drug money when he talked his way into the woman's home before attacking her.

Detectives used fingerprints to help track down Nielsen before arresting him in Tempe.