Subramanyam hacked his wife Vijaya and father-in-law Vemula Venkat to death at Kotapadu in Chatrai mandal of Krishna district on Wednesday night. He also severely injured his mother-in-law and brother-in-law. Injured were admitted to Chintalapudi area hospital. Subramanyam got married to Vijaya four years ago and has been harassing wife and in-laws to register their property on his name. Police registered a case.