(Portrayed by Bahia Watson).
May Theresa Ahearn was a childhood friend of Sylvia Tilly's while she was a junior high school student at Musk Junior High. She even gave Tilly the nickname "Stilly" because she could never stay still.
After Tilly was shocked by a dark matter asteroid she was examining, she began hallucinating that May was an engineering ensign aboard the U.S.S. Discovery. Those hallucinations turned out to be the result of a spore entity that piggybacked on Tilly, attempting to communicate with her by manifesting someone from her memory, when in fact May had died on June 9, 2252 at the age of sixteen.
Once the entity was expelled from Tilly, it turned out to be a blob-like JahSepp, a species that lives inside the mycelial network.