Actually the problem is that these terrorist organization will never accept their leader's death or else there will be chaos all around and the organization may fall. Take Osama for example, no one knows if he is actually alive but his will keep using his name. Lets wait and watch, truth will come out with time!
The dead body attributed to Prabakaran, shown by Srilankan army is that of One Mr.Ganeshraja of Colombo (Nakkeeran). Unable to track him down, the army and police are said to have approached the above hapless man and his fate ended there. But the fate of Tamils will never end and this may be the beginning of their fate.