He justifies this to Dempsey by saying that Jean had planned to kill Dempsey.

Entity and relation annotations:
id: 0
type: entity
value: text: Dempsey
labels: <Person>
id: 1
type: entity
value: text: Jean
labels: <Person>
id: 2
type: entity
value: text: Dempsey
labels: <Person>
type: relation
to_id: 2
labels: Person:harms:Person
from_id: 1