DENVER — A Colorado man charged with killing his family and dumping their bodies at an oil worksite taped a video presentation six years ago about saving or abandoning relationships.

posted in April 2012 shows Christopher Watts giving a PowerPoint presentation that he titled "Communication Speech, Relationship Deterioration and Repair."

Watts opens the presentation by saying it is for a course he was taking.

Then he speaks of infidelity possibly with someone at work as one reason relationships fail.

Police in suburban Denver say Watts was having an affair with a co-worker before he was arrested last week in the slayings of his wife, Shanann Watts, and their two children, ages 3 and 4.

He has not entered a plea to murder and other felony charges.