An undated mug shot shows Wyndham Lathem. (Chicago Police Department)

Monday marked the first day of Wyndham Lathem’s trial, which began more than four years after he and another man allegedly stabbed 26-year-old Trenton Cornell-Duranleau dozens of times.

Wyndham Lathem, left, and Andrew Warren (Chicago Police Department)

A judge has agreed to make public the details of a plea agreement reached this week between Cook County prosecutors and a former Oxford University staffer who says he’ll testify against an ex-Northwestern University professor at his upcoming murder trial.

Wyndham Lathem, left, and Andrew Warren (Chicago Police Department)

Andrew Warren to testify against former Northwestern professor

More than two years after a grizzly slaying that led authorities on a nationwide manhunt, a former Oxford University staffer has pleaded guilty to murder and agreed to testify against his co-defendant, a former Northwestern University associate professor.