S4, E10: Lucas receives an unlikely visitor: his supposedly dead uncle Keith (former series star CRAIG SHEFFER). Meanwhile, the lives of Haley and her unborn child are threatened when she experiences serious complications with her pregnancy. Nathan wrestles with the guilt and consequences of his dealings with Daunte (recurring guest star RICK FOX). Dan tries to make amends for Keith's murder. And Peyton and Brooke try to patch up their differences.