NEW YORK — Former UFC heavyweight champion and professional boxer Francis Ngannou announced Monday that his 15-month-old son, Kobe, has died. Ngannou, who is currently in his home country of Cameroon, memorialized the boy, who he said passed away on Saturday. “Too soon to leave but yet he’s gone. My little boy, my mate, my partner Kobe was full of life and joy,” he wrote on Instagram. “Now, …