They share membership in the summer group, although the plot gives them no deeper personal bond.
Shelly and Andy are both introduced as members of the group traveling to Higgins Haven.
Their connection is established through the shared vacation group.
Shelly and Debbie travel with the same group to Higgins Haven.
Their relationship is shown through their shared presence and Chili's discovery of Shelly's fate.
Chili finds Shelly bleeding after his throat has been slashed and initially believes the scene is another joke.
Shelly's death supplies Jason with the mask that defines his appearance during the massacre.
Jason emerges from the barn wearing Shelly's hockey mask, and Shelly is later found bleeding from a slashed throat before Jason attacks Chili.
Explore the full interactive character relationship map of Friday the 13th Part III