Jackson (Lantree Crewman)

Crewman Jackson was a human male Starfleet officer aboard the USS Lantree. He was killed along with Luke Isao Telaka, Frank J. Anderson, Robert O'Keefe and other crewmembers when they were exposed to the antibodies of the genetically-engineered children on Gagarian IV. 

He was played by a unknown actor. Unlike Telaka, Anderson and O'Keefe, his life readings weren't picked up by the Enterprise-D's sensors.