A medium is found dead on this episode of Castle. In this clip, we see Rick and Beckett disagree on the merits of the victim's profession.
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Stabbed in a neck, and stuffed in a couch... that's no way to die. But that's how a psychic meets her demise, as previewed here for the episode of Castle titled "He's Dead, She's Dead."
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Castle Season 3 Episode 2 Quotes

Don't you believe in fate? Soul-mates? Unicorns? Faeries? Double-Rainbows?

Castle

Castle: I am not saying I can speak with the dead, just that there are people in the world more sensitive than me.
Beckett: Now that's not hard to believe.
Castle: Walked right into that one.
Ryan: uh huh.