Kellin (Crewman)
Crewman Kellin was a male Human officer in the 24th century Starfleet. 

Kellin served during the Dominion War in 2375. He was assigned to AR-558, a planet that the Federation Alliance had captured from the Dominion, under the command of Captain . They were assigned to protect the planet's communication array. Other members of the 150-person unit included Commander , Vargas, , McGreevey, and Lieutenant Nadia Larkin. 

The team successfully held the location for five months, despite expecting to be replaced in ninety days. Over a hundred of the unit were killed over this time, including Loomis and Parker. Kellin worked to understand the Dominion technology in the communications array in order to use it, though he had little success. 

When Captain Benjamin Sisko and his crew arrived to help the unit, Ezri Dax helped Kellin with the array. Sisko ordered them to pause and switch to expose the subspace anti-personnel mines (known as "Houdinis") that had threatened them, and to turn them on the Jem'Hadar. In the process, Dax and Kellin became friends and he was impressed with the engineering knowledge she had. 

Kellin was killed in the final Jem'Hadar attack against AR-558, while saving Ezri's life, before the arrival of reinforcements and relief from the . ()

Appendices

Background information
Kellin was played by Babylon 5 and  star Bill Mumy. The actor had wanted to appear on  ever since the show's first season, and was offered many alien roles, but didn't want to wear extensive prosthetics. ()

Kellin's name is an homage to film actor , whom Mumy had worked with in one episode of Lost in Space. ()

Mumy commented: "Dying in Nicole deBoer's arms? That was fine by me. Of course, it would have been sweet if he'd stuck around for several more episodes, but dying heroically on TV is cool by me".

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Humans
Starfleet personnel (24th century)
Starfleet operations personnel
Starfleet enlisted personnel