- On Castle (2009), he and his wife, Juliana Dever, play husband and wife.
- Valedictorian of his high school class.
- Holds MFAs in Acting from the Moscow Art Theatre and Carnegie-Mellon University.
- A lifetime member of the Actor's Studio.
- Son of a drama teacher father and a history professor mother, Dever began acting at the age of 6.
- Went to undergrad at Northern Arizona University.
- Seamus Dever has appeared in all three of the CSI franchise shows.
- Cousin of Broadway actress Jeanne Arnold and singer Leslie Feist.
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