First came a custody battle and a bitter mother-in-law. Then, the hit men.

Five people are in prison for their roles in the murder-for-hire plot in the death of Florida legal scholar Daniel Markel, among them, his mother-in-law and family matriarch, Donna Adelson.

A wealthy Florida family. A pair of hit men. A law professor gunned down in his home.

The plot to murder Daniel Markel more than a decade ago hinged on a bitter custody dispute and took years to unravel. Earlier this month, a grandmother who’d once worked as a bookkeeper for her family’s dental practice became the fifth defendant sent to prison for their role in the sprawling conspiracy.

Here’s a look at the web of defendants, the man they were convicted of killing and the woman at the center of the plot, who has never been charged with a crime.

DATELINE FRIDAY SNEAK PEEK: Deadly Mischief01:54Florida legal scholar gunned down at homeDaniel MarkelA Harvard graduate and prominent legal scholar at Florida State University, Daniel Markel focused on the philosophy of punishment and spent years examining the subject to better inform sentencing decisions in the criminal justice system, recalled a university colleague, Mark Spottswood. Markel, 41, was also a devoted father of two young boys and, at the time of his death, locked in a bitter dispute with his ex-wife over custody of their children.

On July 18, 2014, Markel had just arrived at his Tallahassee home when a gunman shot him twice in the head and fled. The scholar was pronounced dead the next day.