Dr. Rajkumar ( Real Name : Singanalluru Puttaswamayya Muthuraju April 24 , 1929 â '' April 12,2006 ) was the most popular actor in Kannada 's film industry . Rajkumar , born as Singanalluru Puttaswamayya Muthuraju ( April 24 , 1928 - April 12 , 2006 ) was an actor and singer in the Kannada film industry .