It depends what you mean by 'deadly'. If you're talking about venomous animals - Given the area you mentioned, probably the giant spitting Cobra - one of a number of spitting Cobras that inhabit areas of the African continent..
The most deadly animal in Kenya is the mosquito, due to its ability to transmit diseases such as malaria, dengue fever, and yellow fever. These diseases pose a significant health risk to the population in Kenya.
human
Mostly in Kenya or Egypt are where the most deadliest snakes are, including the cobra
lion
mankind
the grizzly bear
The African lion is the official national animal of Kenya
The Box Jellyfish
wolverines
girraffe
Poison dart frogcrocodile
Humans. Lizards.