This study investigates the prosodic correlates of varied discourse functions for a Cantonese sentence-final particle. Three functions of the particle ge2 were examined: blaming others (Blame), defending oneself (Defend), and asking for reasons (Reason). Ten native adult speakers of Cantonese participated in the production experiments. Results of both Smoothing Spline ANOVA and Generalized Additive Mixed Models suggest that, despite the same citation tone of ge2 (high-rising tone), the pitch of Reason is significantly lower than that of Blame and Defend, and there is no significant difference between the latter two. Besides, mixed-effects regression shows that the relative vowel duration of Defend is significantly shorter than the other two functions. Additionally, k-means clustering suggests that Reason can be reliably classified based on its lower pitch. Blame and Defend have similar pitches and primarily differ in relative vowel duration. Our results suggest that different functions of the same Cantonese particle have different phonetic realization in pitch and duration.