The suspect returned to the scene hours later, according to police.
Bryan's cell phone went back to the students' home at 9:21 a.m. after police tracked his movements.
The crime was not reported to the emergency services until later that day.
The suspect in the University of Idaho murders returned to the scene of the crime the next day, according to police.
A man has been charged with four counts of first-degree murder and one count of felony breaking and entering in connection to the deaths of five people.
He appeared in court in Idaho on Thursday after being extradited from Pennsylvania. He was held without bail.
Moscow police tracked the suspect's movements from November 12 to November 14 after they identified his phone number and vehicle. The killings took place in the middle of the night.
The phone stopped working after the suspect's phone arrived at the scene. After it was turned back on, it moved away from the scene.
Police said the phone left the suspect's home at 9 a.m. and arrived at the scene at 9:21 a.m.
One of the roommates later told police that she had seen a person in their home the night before.
When she woke up, she thought her roommate was playing with her dog.
The roommate opened her bedroom door twice to check on what was happening after she continued to hear noises.
She did not see anything the first time.
She opened it again after hearing a man say, "I'm going to help you."
The sounds of crying, a dog barking, and a loud thump were picked up by a security camera.
According to the affidavit, the roommate saw a figure dressed in black clothing and a mask walking towards her while she opened the door.
She said the man walked past her as she was in shock.
The roommate locked herself in her bedroom as the man walked towards the sliding glass door.
The roommate didn't call for help because he didn't know what to do.
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