Just hours after Lori Hacking disappeared, police fingered her husband Mark as the killer — based on a grisly trail of evidence he left behind.

The ENQUIRER penetrated behind the scenes of the Salt Lake City investigation and learned shocking details of Lori’s final minutes and how she died.

The issue that goes on sale Friday features a five-page special report detailing Mark’s incredible secret life, revealing how he brazenly cheated on Lori … and much, much more.