Second degree murder is the "knowing killing of another." Tenn. Code Ann. 39-13-210(a)(1). Tenn. Code Ann. 39-11-302(b) defines knowing as follows: "Knowing" refers to a person who acts knowingly with respect to the conduct or circumstances surrounding the conduct when the person is aware of the nature of the conduct or that the circumstances exist. a person acts knowingly with respect to a result of the person's conduct when the person is aware that the conduct is reasonably certain to cause the result. "A person can act knowingly irrespective of his or her desire that the conduct or result will occur." State v. Gray, 960 S.W.2d 598, 604 (Tenn. Crim. App. 1997); State v. Rutherford, 876 S.W.2d 118, 120 (Tenn. Crim. App. 1993).