A Russian shop assistant has been found guilty of 48 murders, which he once said he recorded on a chessboard, BBC reported.
A Moscow jury convicted Alexander Pichushkin, known to the Russian media as the "Bittsa maniac", after four hours of deliberation.
Most of the murders were committed over five years, in the Bittsa Park in Moscow's southern suburbs.
Pichushkin has never denied the charges. He was also found guilty on three counts of attempted murder.
He is due to be sentenced later this week.
The jury found there were no mitigating circumstances, and rejected a defence request to clear him of 18 of the killings. The prosecution has requested a life sentence.
Many Russians would like to see him executed but Russia has suspended the use of the death penalty.