(NBC News) — Friday on “Dateline,” after Annastasia “Annie” Hester is stabbed in a Portland, Oregon suburb while sleeping, investigators uncover personal details that point to multiple suspects and possible motives in her murder.

Here is a preview of Josh Mankiewicz’s report:

DETECTIVE AARON TURNAGE: I don’t think there are words to describe the level of intensity in that 911 call.

That’s because the call was made by Annie at 2:59 a.m. It’s a chilling 6-minute long cry for help made shortly after her attacker left those bloody shoeprints behind on the way out.

OPERATOR: 911.

ANNIE: Help, someone tried to kill me.

OPERATOR: 911, how can I help you?

ANNIE: Someone tried to kill me.

At Annie’s autopsy, Turnage understood why Annie was in such pain. There were more than 60 stab wounds, some as deep as eight inches. And strangely, something was carved into her shoulder.

DETECTIVE AARON TURNAGE: It was a v, an x, and then another v. And that’s not a Roman numeral, but that’s what it looked like.

JOSH: Some sorta message? Some sorta signature?

DETECTIVE AARON TURNAGE: Could’ve been. That’s what we were thinking. One of the things that haunts me about this case, is just the level of pain that Annie had to endure for three and a half hours. And still, Annie has the wherewithal to fight for herself, call 911, and get out the information to get law enforcement there.

It was time for Detective Turnage to start getting face-to-face with those who might know who had done this to Annie.

Watch Friday’s “Dateline: The Undoing” on NBC4 at 9 p.m.

About ‘Dateline

“Dateline NBC” is the longest-running series in NBC primetime history and is in its 30th season. Dateline is anchored by Lester Holt and features correspondents Andrea Canning, Josh Mankiewicz, Natalie Morales, Keith Morrison and Dennis Murphy.

Dateline is the #1 Friday newsmagazine and reaches more than 17 million people every week through its broadcast, and millions more through its social media platforms and podcasts.

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.

This past season, Dateline debuted two new podcasts, “Mommy Doomsday” and “Killer Role,” hosted by correspondent Keith Morrison.

In February, NBC also greenlit a straight-to-series inspired by the story featured in the Dateline podcast series, “The Thing About Pam.” Two-time Oscar-winning actress Renee Zellweger will star and executive produce the series, in collaboration with Blumhouse Television, NBC News Studios and Zellweger’s Big Picture Co.