news. >> dropped down to his knees, and he said it's that [ bleep ] derrick. >> reporter: a moment of unguarded grief and rage and thus a possible suspect. derek mower, ken's adult step-son. >> it was apparent there were difficulties between those two. >> reporter: but trouble in the family didn't stop with derrick. >> there seemed to be a riff. >> reporter: but not between dee and ken. theirs seemed to be a genuine love story. but now a grieving dee told detectives she was as baffled about the murder as they were. >> she was not able to provide us any information as to who he was meeting that day or anything about his day. >> reporter: and despite all that friction, the infighting over money and control, dee's family produced not a single viable suspect, not even ken's step-son. >> derrick had an ally buy at the time of the murder. >> reporter: but those initial interviews weren't entirely in vain. a clue emerged from ken's