A Cook County jury convicted Mantas Matulis of second-degree murder Monday night in the death of Tombol Malik, a 23-year-old University of Illinois at Chicago student beaten to death with a bike lock in 2005.

Prosecutors had brought first-degree murder charges against Matulis, 22, alleging he kicked Malik in the head after an accomplice beat him with the lock. But the defense argued Matulis acted in self-defense, and the jury convicted him of the lesser charge after seven hours of deliberation.

The second-degree murder conviction carries a sentence of four to 20 years in prison.