Keith Rocha

From Memory Alpha, the free Star Trek reference.

Lieutenant Keith Rocha was a Starfleet officer who served until 2369. He was decorated twice for valor and given three outstanding evaluations from his previous COs.

On a deep-space assignment on a Federation outpost in the Triona system, Lt. Rocha was killed and absorbed by a coalescent organism. The organism then took his form and transferred to Relay Station 47 where it attempted to absorb Lt. Aquiel Uhnari. During its time at the relay station, it recorded a number of personal logs. (TNG: "Aquiel")