The key location, the door, and the path to the bedroom were documented before anything was altered.

Noah confirmed that the crew used the spare key rather than forcing entry.

The detective asked who knew it was there.

The mother said Derek did.

She also described the household keys he had been allowed to use.

An extra key set on a hook was photographed, but its ownership was checked with her rather than guessed from the place it hung.

Access meant opportunity to enter.