Krishna's name is proposed for the honor. This is accepted by most of the kings' men except a few.
Shishupal now protests to the proposal of this name and speaks bad words to Krishna. Krishna tells him to control himself. But he does not do so and hence, Krishna kills Shishupal with his Surarshana Chakra.
See it marvelously presented in Ramanand Sagar's Krishna serial.
Channel Saurabh Parikh