Section 565.072 - Domestic assault, first degree - penalty1. A person commits the offense of domestic assault in the first degree if he or she attempts to kill or knowingly causes or attempts to cause serious physical injury to a domestic victim, as the term "domestic victim" is defined under section 565.002.2. The offense of domestic assault in the first degree is a class B felony unless in the course thereof the person inflicts serious physical injury on the victim, in which case it is a class A felony.Amended by 2014 Mo. Laws, SB 491,s A, eff. 1/1/2017.L. 2000 H.B. 1677, et al., A.L. 2007H.B. 583 , A.L. 2012S.B. 628 .