Who was the only Sultan of the Ottoman Empire killed in battle?

Murad was killed by a Serbian knight during the Battle of Kosovo in 1389.

https://www.britannica.com/place/Ottoman-Empire

The only Sultan of the Ottoman Empire killed in battle was Murad I. He died during the Battle of Kosovo in 1389, where he led the Ottoman forces against a Serbian army commanded by Prince Lazar. According to historical accounts, Murad was assassinated by a Serbian knight named Milos Obili?, though different sources provide varying details on how and when it happened. His death marked a significant moment in Ottoman history, as it was the only recorded instance of an Ottoman Sultan being killed in combat.