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