Kate Beckett's mother was killed. Castle viewers can expect this issue to be revisited in early 2011.
Added:
Lyle Lovett takes issue with an investigation on "Close Encounters of the Murderous Kind." He tries to shut it down.
Added:
Yes, that's Lyle Lovett. He guest stars on the episode "Close Encounters of the Murderous Kind" as a government official.
Added:
No way alien abduction plays a role on the episode "Close Encounters of the Murderous Kind," right? Right, folks?!?
Added:

Castle Season 3 Episode 9 Quotes

Wow, she looks like an overstuffed sausage.

Castle

What is life without challenges?

Castle