Nothing is known about Therissa's life prior to the outbreak, except she was sent to Ericson's Boarding School for unknown reasons.
At some point, Therissa died during the apocalypse.
While Clementine, AJ, and the other Ericson survivors are throwing a party before rescuing Omar, Aasim, and Violet/Louis from the Delta, Therissa is mentioned when Tenn and Willy are listing off previously-deceased members of Ericson's before Clementine's arrival.
- Killed By
- Unknown Causes
Therissa was killed off-screen prior to Clementine's arrival. How she died remains unknown.
This list shows the victims Therissa has killed:
- Possibly numerous counts of zombies