It just feels like he somehow entered, without breaking in (like breaking a window/door). Otherwise I'd think they'd have been found dead on the first floor (entry) where a conversation was happening, or downstairs to keep their voices from waking the kids upstairs, yet they were found in their bedroom upstairs.
But the time (o'dark-thirty) tells me it wasn't an arranged visit and they weren't expecting him. So how did he get in if there were no signs of forced entry?
Authorities have confirmed there were no signs of forced entry
Investigators say the killings occurred sometime between 2 a.m. and 5 a.m. on Dec. 30, on the second floor of the home.
nbcmontana.com