"Babylon 5" creator J. Michael Straczynski revealed after O'Hare's death, that the actor had suffered from severe mental illness. During the filming of the first season of "Babylon 5", O'Hare began having paranoid delusions, and halfway through, his hallucinations worsened. It became increasingly difficult for O'Hare to continue working, his behavior was becoming increasingly erratic, and he was often at odds with his colleagues. Straczynski offered to suspend production for several months to accommodate treatment; however O'Hare feared that such a hiatus would put the series at risk, and he didn't want to jeopardize others' jobs. Straczynski agreed to keep O'Hare's condition secret to protect his career, and O'Hare agreed to complete the first season, but would be written out of the second season so that he could seek treatment. His departure from the cast was announced without explanation, except that it was mutual and amicable.