Brandishing a butcher’s knife that he had snatched from a mutton shop, a 30-year-old daily wage labourer killed one person and injured five others in a stabbing spree along a 2km stretch of central Bengaluru. M Ganesh’s 30-minute rampage ended after police overpowered him. Ganesh, a resident of Anjanappa Garden, told the cops he didn’t know what he had done. He is suspected to be suffering from mental illness. One person died in the hospital while another is battling for life. The other four injured are out of danger, police said. According to police, Ganesh, who is estranged from his wife, would have frequent fights with his mother and others. “He was reportedly under treatment at Nimhans. We’ll get his medical reports to know his mental condition,” a senior police officer said.