Season 4 aired between 24 Sep 2008 and 20 May 2009, 26 episodes.
Episodes
E01
Mayhem
24 Sep 2008
E02
The Angel Maker
01 Oct 2008
E03
Minimal Loss
08 Oct 2008
E04
Paradise
22 Oct 2008
E05
Catching Out
29 Oct 2008
E06
The Instincts
05 Nov 2008
E07
Memoriam
12 Nov 2008
E08
Masterpiece
19 Nov 2008
E09
52 Pickup
26 Nov 2008
E10
Brothers in Arms
10 Dec 2008
E11
Normal
17 Dec 2008
E12
Soul Mates
14 Jan 2009
E13
Bloodline
21 Jan 2009
E14
Cold Comfort
11 Feb 2009
E15
Zoe's Reprise
18 Feb 2009
E16
Pleasure Is My Business
25 Feb 2009
E17
Demonology
11 Mar 2009
E18
Omnivore
18 Mar 2009
E19
House on Fire
25 Mar 2009
E20
Conflicted
08 Apr 2009
E21
A Shade of Gray
22 Apr 2009
E22
The Big Wheel
29 Apr 2009
E23
Roadkill
06 May 2009
E24
Amplification
13 May 2009
E25
To Hell... (1)
20 May 2009
E26
...and Back (2)
20 May 2009