(NBC News) — Friday on “Dateline,” Josh Mankiewicz reports on the murder of a hard-charging boss in Arizona that uncovers a complex web of bruised egos in his professional life, and a trail of broken hearts in his personal life.

Here is a preview of Mankiewicz’s report:

It all began with Nicholas Morelos.

KRISTINA TREPANITIS: That’s the man I’m supposed to marry. And he’s just laying there, and he’s just full of bullet holes.

While Nick’s family faced the loss of a man they loved, investigators began to learn he was not beloved by everyone.

MANKIEWICZ: What do you think the motive was here?

PROSECUTOR JONATHAN MOSHER: Obsession and hatred, this is a stone-cold assassination.

Watch “Dateline: Stone-Cold” Friday at 10 p.m. on NBC4.

About ‘Dateline’

“Dateline NBC” is the longest-running series in NBC primetime history and is in its 33rd season. Dateline is anchored by Lester Holt and features correspondents Blayne Alexander, Andrea Canning, Josh Mankiewicz, Keith Morrison and Dennis Murphy.

The stories range from compelling mysteries to powerful documentaries and in-depth investigations. When major news breaks, they go to the scene, putting the pieces together to bring the viewer the full picture. And in every story they tell, they help the real people who lived the events share their journeys with the viewer.