Two murder suspects in custody after cross-country manhunt

Wyndham Lathem and Andrew Warren surrendered 9 days after a man was found stabbed to death in Lathem's home.
1:54 | 08/06/17

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Transcript for Two murder suspects in custody after cross-country manhunt
Eva pilgrim tonight, thank you. Next to a manhunt for two murder suspects. A northwestern professor and an employee from oxford university accused of killing a man in Chicago. The FBI and U.S. Marshals tracking them down thousands of miles away. Here is ABC's erielle reshef. Reporter: Tonight, investigators trying to unravel the grizzly details leading up to a gruesome murder and cross-country manhunt. Police believe they have a doa there, at 540 north state. Reporter: These two men -- Wyndham Lathem, a northwestern university professor, and Andrew Warren, an oxford university employee -- surrendering more than 2,000 miles from where police say 26-year-old cosmetologist Trenton cornell-duranleau was brutally stabbed to death. Chicago pd telling ABC news it started on July 27th with a cryptic phone call to the front desk of Lathem's apartment building reporting a crime. At around 8:30 P.M., officers enter the professor's home, discovering duranleau's "Mutilated" body with "Excessive stab wounds." Police describing a "Graphic and gruesome scene." Police say Lathem, an expert in dangerous biological agents, and duranleau had a relationship. We were just devastated. My heart dropped to my knees. Reporter: The suspects driving to Wisconsin, police say, stopping at this library and making a mysterious $1,000 donation. It turned out the individual they wished that donation for was a homicide victim. Reporter: Investigators tracing Warren, reported missing by his family in the U.K., and Lathem to California. Police say Lathem sending videos to friends and family apologizing, calling it "The biggest mistake of my life." On Friday night, Lathem and Warren surrendering in the San Francisco bay area after nine days on the run. Tom, both men are awaiting extradition to Illinois. Police tell me they plan to interrogate the two in the coming days in hopes of determining a possible motive. Tom? Thank you. Let's turn to politics now

This transcript has been automatically generated and may not be 100% accurate.

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