The following definitions apply to this Criminal Code:

(1) INTENTIONALLY. A person acts intentionally with respect to a result or to conduct described by a statute defining an offense, when his purpose is to cause that result or to engage in that conduct.

(2) KNOWINGLY. A person acts knowingly with respect to conduct or to a circumstance described by a statute defining an offense when he is aware that his conduct is of that nature or that the circumstance exists.

(3) RECKLESSLY. A person acts recklessly with respect to a result or to a circumstance described by a statute defining an offense when he is aware of and consciously disregards a substantial and unjustifiable risk that the result will occur or that the circumstance exists. The risk must be of such nature and degree that disregard thereof constitutes a gross deviation from the standard of conduct that a reasonable person would observe in the situation. A person who creates a risk but is unaware thereof solely by reason of voluntary intoxication, as defined in subdivision (e)(2) of Section 13A-3-2, acts recklessly with respect thereto.

(4) CRIMINAL NEGLIGENCE. A person acts with criminal negligence with respect to a result or to a circumstance which is defined by statute as an offense when he fails to perceive a substantial and unjustifiable risk that the result will occur or that the circumstance exists. The risk must be of such nature and degree that the failure to perceive it constitutes a gross deviation from the standard of care that a reasonable person would observe in the situation. A court or jury may consider statutes or ordinances regulating the defendant's conduct as bearing upon the question of criminal negligence.