Runehamster: Apparently, in the U.S., if you're acquitted in a murder trial, you can then go on to brag about how you did it since you can never be re-tried. And I just realized this contributes nothing to this discussion, but it reminded me of this.
FlintlockJazz: Does this mean that you could then write and publish a book called "How I Killed Bob" with an indepth look at how you performed the deed, the whys, and pleasure you took from it and make a fortune off the royalties?
No, you'd still be liable in civil court because that's regarded as a different crime, but you wouldn't be able to go to prison for the murder, in that scenario.
Also, a lot of places have "Son of Sam" laws in effect to prevent that, but AFAIK that only kicks in if you're convicted. It's somewhat ironic in that David Berkowitz, one of the Son of Sam killers never had any interest in profiting by his book, at this point he's a devout Christian and has no interest in ever being released from prison for his part in the murders he committed.
Interestingly enough, while he claims responsibility for several of the murders, he denies others and the witness testimony indicate that he's probably being honest about that.