Alternate reality
Cadet McGrath was a Starfleet cadet who entered Starfleet Academy in the 2250s of the alternate reality.
When Vulcan was attacked by the Narada in 2258, McGrath was assigned to the USS Wolcott to assist in the rescue attempts. (Star Trek)
This character was only mentioned in dialogue.
This cadet's fate is unknown, but since the starship they assigned to was destroyed, is is highly likely they perished along with it.