Nelson

Nelson was a med-tech aboard the USS Cantabrian (NCC-24705), working in the ship's morgue.

In 2372, he was murdered by the Myhr'an clone, who, in turn, took on his identity. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part One")


 * We assume Nelson was a lieutenant as he had his own quarters.

Nelson
In 2372, Nelson was romantically involved with Lisa Oh. He stood her up (which, she admitted, wasn't like him) on a date, but Oh later found this was due to the real Nelson being dead. She discovered his body with Wrightson, and she was very upset at the loss. It is not known where they met or when they started dating but it is assumed this was at Utopia Planitia Fleet Yards or earlier as Oh had Nelson's pass-code to his quarters, indicating a serious relationship. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part One")