565.052.  Assault, second degree, penalty. — 1.  A person commits the offense of assault in the second degree if he or she:

  (1)  Attempts to kill or knowingly causes or attempts to cause serious physical injury to another person under the influence of sudden passion arising out of adequate cause; or

  (2)  Attempts to cause or knowingly causes physical injury to another person by means of a deadly weapon or dangerous instrument; or

  (3)  Recklessly causes serious physical injury to another person; or

  (4)  Recklessly causes physical injury to another person by means of discharge of a firearm.

  2.  The defendant shall have the burden of injecting the issue of influence of sudden passion arising from adequate cause under subdivision (1) of subsection 1 of this section.

  3.  The offense of assault in the second degree is a class D felony, unless the victim of such assault is a special victim, as the term "special victim" is defined under section 565.002, in which case it is a class B felony.