Mangaluru: A senior citizen was stabbed to death by unidentified miscreants at his house in Malli Layout, Kavoor police station limits, on Tuesday afternoon. The victim is Surendran,60. The victim stayed at Kavoor along with his wife. Police said that on Tuesday morning, the victim had gone to the city and his wife to their farm. He had returned around 1pm and was stabbed to death by unidentified miscreants. Police added that his wife was unaware about his murder, and learnt only when she returned home in the evening. A large crowd had gathered outside their house. Sources from the police department added that business rivalry may have caused the murder. A case has been registered at the Kavoor police station in this regard and an investigation is on.