 Mark Niederbrock arrived at the home three days later, Sept. 17 about 5 p.m., and McCroskey attacked him with the maul in a living room, Ennis said.McCroskey later moved Mark Niederbrock's and Wells’ bodies into Emma's room, and he attempted to clean up the bloody den, Ennis said.At some point, McCroskey used a digital camera to record a video of himself, according to Ennis.