Update from HLN reporter Barbara MacDonald:
ISP has confirmed to her that a news conference will take place Monday to provide an update on the case.
She spoke to Doug Carter, he told her a name and photograph would be released on Monday but would not confirm that an arrest had been made. He called this a "development" that is not the end of the investigation but rather opens up a new chapter. He described it to her as a "fascinating" tale of how investigators were able to get where they are.
The probable cause affidavit is sealed and will remain sealed, we are not expected to get details from this document on Monday.
Video at source: