Cassie's mother and father's deaths. How did they die?
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Cassie's mother died after contracting the 3rd Wave virus. Commander Vosch killed her father after he was interred in a refugee camp.
The 5th Wave
Cassie's mother died of the 3rd Wave, which was the pestilence, and Cassie's father was shot and killed by Commander Alexander Vosch (who's bad).
Mother: Plaque 3rd wave
Father: 3rd wave by vosch
Mrs. Sullivan got the virus and then she died. Mr. Sullivan was killed by Commander Vosch.