Walter was a male Admiral in Starfleet in the 2370s, known to be a proponent of exploration, a reasonable man and a strong figure within the admiralty.

In 2376, Elias Vaughn chose to contact Admiral Walter, rather than Alynna Nechayev or Edward Jellico, and inform him of the delay in the refit and repair of the USS Defiant and consequently its mission to the Gamma Quadrant. (DS9 novel: Twilight)