Home People Diego Klattenhoff Diego Klattenhoff shows Diego Klattenhoff shows Diego Klattenhoff TV Shows (7) The Blacklist (2013) As Donald Ressler, He was 34 years old Homeland (2011) As Mike Faber, He was 32 years old Mercy (2009) As Mike Callahan, He was 30 years old Psych (2006) As Dylan Maxwell, He was 27 years old Whistler (2006) As Derek, He was 27 years old Supernatural (2005) As Duane Tanner, He was 26 years old Smallville (2001) As Josh Greenfield, He was 22 years old
