The Last Day of Our Acquaintance

S7 E18: As Brooke angrily deals with Alex's (recurring guest star JANA KRAMER) tryst with Julian, Lydia's (recurring guest star BESS ARMSTRONG) condition worsens, prompting Quinn and Haley to try to reconnect with Taylor (recurring guest star LINDSEY McKEON). Clay is forced to deal with Katie's (recurring guest star AMANDA SCHULL) unsettling advances, and Nathan helps Jamie come to terms with Lydia's impending death.