In 2262, he arrived on Babylon 5 with others to join Byron Gordon's colony of telepaths living in Downbelow. He was beaten up by a group of thugs who hate and fear telepaths. When a violent faction of telepaths seized Medlab and took staff and patients hostage, they took Peter out of his bed while still recovering and asked him to cover them in the hallway using his "special gift".
When Byron and those of his followers who had committed violence attempted to surrender to Captain Lochley, Peter was among them. He died with the rest when Bester caused an explosion so that they wouldn't have to return to PsiCorps.