Pieces of human flesh found blocking the sewage system-of-a-society near Mumbai led police to uncover the mystery behind a missing man. Ganesh Vitthal Kolhatkar, 58, was killed by a friend last-week in Bachraj Paradise Society in Virar, near Mumbai, for not being able to pay a loan of Rs.1L, police said. A case was registered and the accused has been arrested, the police said.