Lieutenant Shea is the Enterprise security officer in By Any Other Name whom the Kelvans reduce to a small porous block alongside Yeoman Thompson, and who alone is restored.
Lieutenant Shea is a security officer in the landing party that answers a false distress call in the Original Series episode By Any Other Name. The party is captured by Rojan's Kelvans, who mean to take the Enterprise to Andromeda.
After an escape attempt, Rojan decides to show Kirk the price of resistance. Hanar uses his belt device on Shea and Yeoman Leslie Thompson, turning each into a dry block that holds everything the person is.
Rojan picks up one block and crushes it to powder, then has the other restored. It is Shea who reappears, unharmed and unaware of what has happened, while Thompson is dead. The demonstration makes clear to Kirk that open defiance will only cost more lives.