Dikembe Mutombo – the imposing Congolese-American center – has died at the age of 58. A figure who endeared himself to sports fans during and after his playing career, Mutombo died following a battle with brain cancer.

He was a defensive force on the court who changed the way the game of basketball is played. But more importantly, Dikembe truly changed the world and improved countless lives through his humanitarian work in Africa.