Tamil writer and producer Panchu Arunachalam passed away on Tuesday in Chennai at the age of 75. He worked with actor Rajinikanth in the film 'Aarilirunthu Arubathu Varai' and with Kamal Haasan in films like 'Kalyanaraman', 'Japanil Kalyanaraman' and 'Apoorva Sagodharargal'. Arunachalam also directed films and wrote song lyrics for over 200 films.