Lenny was a marine in the Dominion Marine Corps. He held a drone punting record of 2 meters, the lowest among the marines he competed with. Lenny met his end at the scythes of a hydralisk, whose blows he had tried to block with his C-14 rifle. The scythe cleaved the rifle in two, and killed Lenny as well.
Barba, Rick. StarCraft Field Manual (hardcover). Insight Editions, November 17, 2015.