Lieutenant Marcus was apart of the security team serving in the USG O'Bannon.
Events during Dead Space: Aftermath
During the Necromorph outbreak, captain Caleb Campbell ordered him to take a security team and headed to the Engine Room to check on the engineers after Campbell lost contact with them. He, Alejandro Borges, and Lana were the only ones who escaped from the Engine Room to the science lab. There they met up with Nikolas Kuttner, Isabel Cho, Nolan Stross, and captain Campbell.
When it was decided that they would head back to the Engine Room to destroy the shard, planetary debris broke through the ship's hull, creating a vacuum. Marcus did his best to hold on as Kuttner attempted to rescue him, but a Necromorph jumped him, causing him to lose his grip and got blown out into space.
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