as in canon, jeremy's death means that he is able to see ghosts.

before she passed onto the otherside, elena thanked her brother for always being there for her. 

she explained that she had chosen to find peace, with their parents, jenna and john, rather than return to her body and continue to be used by the supernatural.

she warned that katherine was now masquerading as her, but jeremy agreed to never say a word as he knew his sister was happy with her choice.