Included in that list was that the "murder was committed while the defendant was under the influence of extreme mental or emotional disturbance." Utah Code Ann. § 76-3-207(2)(b) (Supp. 1982) (current version at Utah Code Ann. § 76-3-207(4)(b) (2003)); see also id. § 76-3-207(2)(g) (allowing capital defendants to present "any other fact in mitigation of the penalty" during the sentencing phase of trial) (current version at Utah Code Ann. § 76-3-207(4)(g) (2003)).