The 4th death anniversary of noted fiction writer and filmmaker Humayun Ahmed was observed on Tuesday.Humayun Ahmed’s two younger brothers - Prof Muhammad Zafar Iqbal and Ahsan Habib - along with their family members and relatives placed wreaths at his grave in Nuhash Palli of Gazipur.Later, Humayun’s wife Meher Afroz Shaon with her two sons - Nishad and Ninit - offered prayers at the grave around 11:45 am.Different socio-cultural organisations also observed the day with elaborate programmes.Born in November 13 1948 in Mymensingh, Humayun Ahmed died on July 19, 2012 at Bellevue Hospital, New York, at the age of 64 after a nine-month battle against colon cancer, bringing the curtain down on an illustrious career of nearly four decades.