It took a couple weeks, but Dexter Morgan finally mourned the loss of his wife in the only way he knew how to last night: murder.

But this serial killer was unusually sloppy at the conclusion of "Practically Perfect," leaving fingerprints and blood splatters all around the scene of Boyd Fowler's dead body.

He was also spotted by... Lumen?!? That's the name of the character played by Julia Stiles, who viewers briefly met this week and will get to know better next Sunday. Get a sneak peek at the episode "Beauty and the Beast" now:

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Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.