Leo is a gravedigger found outside the East Ardougne church after being hired by Councillor Halgrive in burying the dead. However, he isn't very good at the job, and asks the player if he is holding his "trowel" the right way, which the player corrects, telling him it's a spade.
He was formerly part of the Gravediggerrandom event. He used to ask players to check the contents of 5 coffins and place them in their appropriate graves according to their headstones.
Leo appears to be wielding a spade in the same fashion as a player would wield a 2h sword before EoC.