Eminent social activist Anna Hazare has received another threat letter that states that he has to declare his property and name his heir, failing which he will be killed. The letter was received by Hazare's office at Ralegan Siddhi yesterday. A formal complaint about the incident has been registered with the Parner police station in Ahmednagar district of Maharashtra. <br/><br/>The writer of the letter identifies himself as Ambadas Lashkare, a resident of neighboring Nevasa taluka. According to Hazare's aides, this is the 15th threat letter received by Hazare's office in last three years and the sixth letter which is signed by the name Lashkare.