Dexter struggles to distance himself from Miguel, who will be his best man at his wedding, and starts plotting to kill him. LaGuerta begins to believe that Miguel is Ellen's killer, and searches his car for forensic evidence after inviting him over for dinner. Miguel realizes that LaGuerta suspects him of Ellen's murder, and decides to kill her. When Debra starts avoiding Anton, Dexter tells her of their father's affair with his informant, Laura Moser, without revealing that she was also Dexter's biological mother. Debra discovers The Skinner's whereabouts, but he escapes when Quinn is injured. Dexter's relationship with Miguel comes to a violent end.