Was that the first or second time he was interviewed?
Was he detained after that interview?
I am guessing this was the second interview because in the pc doc on page 2, "....on Monday, September 9, 2013, the Defendant was re-interviewed at 11:09 pm at Illinois State Police District 12 Headquarters in Effingham...." It goes on to report it was during this interview JD gave the statements regarding the events that led to Willow's death.
Edited to fix bad link. Try this: http://fox2now.com/2013/09/11/new-details-emerge-in-death-of-willow-long/