<Tr> <Td_colspan="7"> Dexter is sent to investigate a horrific blood - soaked crime scene, which he usually enjoys, but is taken aback by a long - suppressed memory of a childhood trauma instead . Rita is charged with assaulting Paul and could lose her children in a custody battle . However, when Dexter finds out, he decides to remove Paul from his and Rita's lives, but by framing him rather than killing him . Angel investigates a hunch regarding the Ice Truck Killer concerning amputee fetish; he turns to Rudy for help but ends up getting stabbed in the parking lot . Meanwhile, Rudy displays a growing interest in getting to know Dexter, particularly in the lately awoken trauma he had recently experienced . </Td> </Tr> <Tr> <Th> 11 </Th> <Td> 11 </Td> <Td> "Truth Be Told" </Td> <Td> Keith Gordon </Td> <Td> Drew Z . Greenberg and Tim Schlattmann </Td> <Td> December 10, 2006 (2006 - 12 - 10) </Td> <Td> 0.76 </Td> </Tr> <Tr> <Td_colspan="7"> The Ice Truck Killer strikes again, leaving a real nightmare before Christmas at Santa's Cottage . Sergeant Doakes becomes more suspicious about Dexter after his ambivalence about Batista's survival . Dexter finally finds he is connected to the Ice Truck Killer over a past case involving Harry Morgan and a blood - bath crime scene in 1973 involving Dexter's biological mother . Lieutenant Maria LaGuerta braces herself as Captain Matthews blames her for the department's failure to find the Ice Truck Killer and he has her replaced . Rudy and Debra spend some quality time together, and Rudy proposes marriage to the smitten detective . Rita decides to take her children, Astor and Cody, to visit Paul, who has been sent back to prison . </Td> </Tr> <Tr> <Th> 12 </Th> <Td> 12 </Td> <Td> "Born Free" </Td> <Td> Michael Cuesta </Td> <Td> Daniel Cerone and Melissa Rosenberg </Td> <Td> December 17, 2006 (2006 - 12 - 17) </Td> <Td> 1.08 </Td> </Tr>

When do they find out who the ice truck killer is