Death of Susan Sontag (American writer and theorist) on December 28 marks the passing of a prominent figure in American literature and cultural criticism. Susan Sontag died in 2004 at the age of 71 in New York City. She was widely recognized for her influential essays, books, and activism, which shaped critical discourse in the late twentieth century. Sontag gained international acclaim with works such as "On Photography" and "Illness as Metaphor," which explored the intersections of art, society, and politics. Her writings were translated into over thirty languages, and her essays appeared in leading international publications. Beyond her literary achievements, Sontag was known for her social and political engagement, including her opposition to war and advocacy for human rights. Her death on December 28, 2004, received significant attention in global media and cultural circles. Writers, artists, and intellectuals reflected on the profound impact of her ideas and contributions. Memorial events were held in various cities to honor her life and intellectual legacy, and her works continue to be studied and discussed in academic and cultural settings. This observance was added to the Gregorian calendar following Sontag's death in 2004, due to the widespread recognition and commemorations organized by literary and cultural institutions.