A 20-year-old man from the Siberian city of Barnaul suspected of killing his grandfather has blamed a computer game character for the crime, according to the Investigative Committee's Altai branch.
Investigators say the suspect stabbed his 79-year-old grandfather more than 10 times and his 83-year-old grandmother at least 20 times while visiting them at their home on Aug. 23.
The grandfather died on the spot, the grandmother was taken to a hospital, and the man himself returned home before being detained by police.
He had not bothered to try to hide the murder weapon, investigators said in a statement.
The young man denies committing the crime and blamed the killing on one of the characters in a computer game, the statement said.
"According to preliminary information, the young man does not have a job and is not studying, and he spends all his time playing computer games," investigators said.