Portrayed by
First seen
Last seen
Appeared in
Mentioned in
Episode count
Centric episode(s)

Shared centric episode(s)

Non-centric episode(s) featuring flashes

Centric mobisode(s)

Also known as
Date of birth
Date of death
Manner of death
Scotland, United Kingdom
In Australia...
On the plane...
On the island...
Family members
Ruth - Sister
Ruth's brother

S1 - S2 - S3 - MP - S4 - S5 - S6


Derek is Ruth's brother who was first seen entering the monastery where Desmond works, while Desmond is packaging wine. He walks right up to Desmond and punches him in the face. He then apologizes to Brother Campbell before leaving. Desmond later visits Derek's house, and it is discovered that he is the brother of Ruth, Desmond's jilted former fiancée. He is reluctant to allow Desmond in, but is interrupted by Ruth, who invites Desmond in. ("Catch-22")


  • The name Derek (originally Theodoric) is of English and Old German origin. It means "ruler of the people". [1][2][3]
  • During casting for "Catch-22", he was described as "Kenneth. 20's, Male, Caucasian, Scottish. Kenneth is a working class type who is quite quick to throw a punch." [4]

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