(a) Voluntary manslaughter is knowingly killing a human being committed:
(1) Upon a sudden quarrel or in the heat of passion; or
(2) upon an unreasonable but honest belief that circumstances existed that justified use of deadly force under K.S.A. 21-5222 , 21-5223 or 21-5225 , and amendments thereto.
(b) Voluntary manslaughter is a severity level 3, person felony.