reporter: she watched helplessly from work as a stranger rummaged through her room. he touched made pillows. reporter: going through belongings but taking an i sbod chargers from claire and her roommate. he had to open both doors. reporter: she says the man got keys to her house by intercepting a package delivered that morning. he was in her room for only about 12 minutes. it s just weird and gross and wrong. reporter: but thanks to an iphone application that streams motion activated snapshots, claire saw exactly what happened. detectives are going over footage. reporter: kusa aired claire s footage the night of the crime. a viewer recognized the intrude somewhere tipped the police off. i m sure she was terrified. reporter: the following morning a detective called claire to let her know a suspect was arrested. the alleged thief denied stealing anything. the icam costs $4.99 but it could be the best five bucks