The Marauders died in reserve order that their names were printed on the Marauders map.

Messrs Moony, Wormtail, Padfoot and Prongs

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The Marauder's Map

Harry's dad, Prongs, died first in HP and the Philosopher's stone.

Then Sirius, Padfoot, died in HP and the Order of the Phoenix

Then Peter Pettigrew, Wormtail, died in HP and the Deathly Hallows.

Last Remus, Moony, died during the battle of Hogwarts in HP and the Deathly Hallows