It was from a Radar Online Exclusive (19 October 2018):
"There is a report that someone allegedly knocked on the door and as the father went to answer it gunfire erupted through the door. That has not been confirmed yet as it’s an active investigation,” an FBI source exclusively told RadarOnline.com
As Radar readers know, investigators have been tirelessly searching for the 13-year-old who disappeared from her Barron, Wisconsin house on Monday, October 15. That same day, police found Closs’ parents, James Closs, 56, and Denise Closs, 46, dead of gunshot wounds inside the home.
“The mother appeared to have barricaded herself in the bathroom and called police,” added the insider, explaining that she was not able to reach the dispatcher before being killed.
Like the neighbours, Radar Online appear to have inside information from the FBI (if you believe them of course!). This story is where the 'Denise barricaded herself in the bathroom' came from.