A Russian karate expert has been charged with beating to death a 61-year-old woman and her son, whom he accused of infecting his wife with lice, an investigator said Friday.

The drunk 26-year-old burst into a neighboring room in his hostel Tuesday and used karate moves to kill the pair, state investigator Eduard Abdullin said by telephone from Kazan, a city 700 km (430 miles) east of Moscow.

“He literally beat them to death with his hands and feet,” Abdullin said. “The family were poor and drank a lot. He blamed them for infecting his wife and the entire corridor with lice.”