Elaine Johnson

From Memory Alpha, the free Star Trek reference.

Elaine Johnson was a Human female born in 2240, who was married to Robert Johnson. During the 2260s, she was a member of the experimental science colony on Gamma Hydra IV.

When the planet went through the trail of a comet in 2267, radiation hit the planet, causing all the colonists to age rapidly and die of premature old age. Johnson survived until the arrival of the USS Enterprise (NCC-1701) and was brought to sickbay, but died soon after. (TOS: "The Deadly Years")

Elaine Johnson was played by Laura Wood.