Barnhart

From Memory Alpha, the free Star Trek reference.

Barnhart was a crewman aboard the starship Enterprise. In 2266, Crewman Barnhart was killed on deck 9 of that vessel by the M-113 creature. (TOS: "The Man Trap")

Barnhart was played by actor Budd Albright, and was one of many Enterprise crewmembers to perish in the line of duty. For more, see the starfleet casualties.

Barnhart died wearing the rarely seen Starfleet utility vest uniform, and was carrying his headgear. Some theorize he could have been wearing radiation protection or involved in extravehicular activity or a flight crew, but there is no evidence to support this.