The mysterious death of Lisa Fisher (Lili Taylor)--revealed in the third-season finale, Im Sorry, Im Lost--casts a dark shadow across the entire fourth season of this critically acclaimed HBO drama. As funeral director Nate (Peter Krause) grapples with single parenthood and the aftermath of his wifes apparent drowning, he makes his way back into the arms of ex-girlfriend Brenda (Rachel Griffiths). Their reunion does little to help Brendas budding romance with a hunky neighbor (Justin Theroux), but it does plenty to upset Lisas grieving family. Meanwhile, David (Michael C. Hall) finds his newfound domesticity with boyfriend Keith (Mathew St. Patrick) interrupted by a surreal carjacking incident. As David slowly cracks up, Keith goes out on the road to provide security for trashy pop star Celeste (guest star Michelle Trachtenberg), who at one point unexpectedly seduces him. Art-school student Claire (Lauren Ambrose), too, find herself batting for the other team when she takes up with audacious performance artist Edie (guest star Mena Suvari). The relationship doesnt last, but ex-boyfriend Russell (Ben Foster) does help Claire stumble upon the new artistic direction that will lead to her first gallery show. Fisher matriarch Ruth (Frances Conroy) slowly gets to know the real George Sibley (new series regular James Cromwell), whom she impulsively married before learning about his history of mental illness. Meanwhile, family man Federico (Freddy Rodriguez) finds his own marriage disintegrating after he gets caught up in an affair with a needy lap dancer (guest star Idalis DeLeon). With its even darker-than-usual storylines, apocalyptic imagery and shocking revelations, the fourth season of Six Feet Under alienated some fans and critics. Nevertheless, the show remained a strong ratings performer during this slightly shorter, 12-episode run. ~ Brian J. Dillard, All Movie Guide