Lester Holt

Her mom said she'd rush up to Tallahassee to be with her.

Then Wendy hung up.

Tallahassee police took photos and swabbed her hands for gunshot residue.

None was found.

Georgia Kappelman is chief assistant state attorney in Leon County, Florida, and would review Wendy's interview with law enforcement.

That it wasn't a happy marriage in the end and it was a very bad divorce.

That's part of a classic recipe for homicides.

But detectives later checked out her alibi and confirmed that she could not have shot her ex-husband.

Now they wondered if someone she knew could be behind it.

Wendy told them she'd been seeing another man after the divorce.

Jeffrey LaCasse, an associate professor of social work at FSU.

When did you ask him that?

Just a few days before Dan Markell was gunned down in his garage, Wendy said she wanted to cool things off because Jeff had become increasingly jealous.

Is Jeff a violent person?

Not at all?

Jeff own a gun?

So the Tallahassee police tracked down Jeff Lacoste, who had a lot to say about Wendy.

Have you met Wendy?

Jason Newlin is the chief investigator for the Leon County State Attorney's Office and worked closely with the Tallahassee police and the FBI on the case.

Did you think Lacoste was still head over heels for Wendy?