Bill Pierson was a Cross Photonics security guard who had worked for Cross Photonics for five years.
When the Special Projects Group brought an unconscious Lycaenops back to Cross Photonics from an Anomaly incursion, they had Bill guard the van it was in with Samantha Sedaris, lying to Bill that the van contained a new Cross Photonics prototype.
When Bill and Sam were playing cards while guarding the van, the Lycaenops in the van awoke while Bill was alone by it. Thinking that there was an intruder in the van trying to steal the supposed prototype, Bill investigated, and the Lycaenops immediately killed him by pinning him down and biting his neck open. (Undone)