Rahul Gupta, a George Washington University graduate student, changed his narrative several times in court, but he did acknowledge that he killed his friend Mark Waugh, 24.
On October 13, 2013, Gupta, his girlfriend and Waugh went to the Indian-American's high-rise apartment in Silver Spring, a suburb of Washington, DC, where he caught Waugh cheating with his girlfriend.
Waugh died after being stabbed and slashed 11 times inside the apartment.
According to the arrest report, Gupta told police: "My girl and my buddy were cheating, my girl was cheating with my buddy. I walked in on them cheating and I killed my buddy."
Gupta and Waugh knew each other from high school.
Waugh was a first-year law student at the Georgetown University at the time his best friend killed him.
Gupta, an engineering graduate student, was arrested in October 2013.