Louis Sullivan Jr.

Louis Sullivan Jr. was a researcher at the Pytheas moonbase during Prey: Mooncrash.

Background
Louis Sullivan Jr. was assigned to the Crew Annex with the title of "Exotic Matter Study", though from several of his research files it is likely that he worked mostly in Pytheas Labs. When the Typhon invaded, Louis was watching Kathy Cheema perform a biopsy in the Lab Morgue, and watched her get killed by a Thermal Mimic. At some point while fleeing the Typhon, he picked up a weapon from Liu Mok's corpse.

Louis managed to hide with several other survivors behind a Typhon Gate, before a Voltaic Mimic disabled the gate, allowing the Typhon to slaughter everyone. Louis was the only survivor of the incident.

Some hours later Louis became trapped somewhere due to a Telepath being outside the door, and to avoid becoming a Mind-Controlled Human appeared to consider committing suicide with his pistol out of defiance.

Mooncrash
Peter finds Louis dead in the shuttle connected to the Crew Annex that serves as one of the five escape routes. He was killed by a Mimic when the shuttle was compromised, implying that he managed to escape his encounter with the Telepath. Louis Sullivan Jr. carries random loot.

It is important to note that, as with all other missing TranStar personnel in the escape shuttle, Louis Sullivan Jr. can no longer be found in a run after the shuttle escape is used. The only way to find him again is to reset the simulation.

Trivia

 * Louis Sullivan Jr. is the son of Louis Sullivan. They both have similar roles - both conduct Typhon-related research, both are caught in and likely perished in a major Typhon outbreak (the Pobeg Incident and the Pytheas outbreak respectively), and both serve as characters who write down Research observations for several types of Typhon (Greater Mimics, Cystoids, and Cystoid Nests for the elder and Poltergeists, Mind-Controlled Humans, and Voltaic and Thermal Mimics for Junior).