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From Wikipedia: https://en.wikipedia.org/wiki/Dexter_(season_1)

Dexter S1 Ep 8: Shrink Wrap

 An unexplained suicide of a wealthy and powerful woman leads Dexter to suspect that her psychologist, Dr. Emmett Meridian, may have killed her. But he gets a shock when a visit to the suspect reveals dark secrets from Dexter's past. Elsewhere, Rita becomes warmer towards her ex-husband Paul, who claims to have reformed. She wants to become more intimate with Dexter, who is afraid of physically consummating their relationship, but then he is able to have sex with her and once they have finished, he is worried that he might have scared her. Meanwhile, Debra is falling in love with her new boyfriend Rudy. At the end of the episode, the audience finds out that Rudy is the Ice Truck Killer, while unknown to the characters.