Helping a friend find a book about a serial killer

[Sarah]

OK sooo I really need help from those who are dedicated book readers. I'm looking for a book I read when I was about 13 or 14 (2005/2006) it was about a serial killer, I cannot for the life of me remember the name just the gory details of said book. He was a well dressed skinny blonde man, I remember he shot or stabbed a guy and threw him into the ocean off a pier and the guy was mauled by sharks while he was still alive. Um he smoked had multiple wives I think. I've tried googling but obviously not getting anywhere without a name. Helllllp

[Lobstergirl, au gratin]

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