But Actually ...
Haha, nope! While it seems that the psychic's prediction came true, it also reveals a lot of the tricks of the "pretend to be a psychic" trade , if you analyze the case closely.
First of all, predicting that the body would be found near a body of water immediately becomes less impressive when you consider the fact that the "psychic" was talking about the victim of a serial killer who was known to be stalking a very specific area of New York: Long Island. For those of you unfamiliar with the area, Long Island is a fucking island.
Yes, an island. Suck on it, peninsulas.
As for the bit about "a sign with a G nearby" ... they are on goddamned Long Island. Any sign referencing the area in any way would've had a "G" in it, not to mention the thousands of other "G"-bedazzled signs you would find in a big city (as in the case of the "Gilgo Beach" sign -- it contains a "G" along with eight other letters the psychic could have guessed).
Being a psychic detective is in fact nothing more than making educated guesses and shrouding them in enough vague oracle-sounding bullshit so that they can say they predicted the outcome once the police actually solve the mystery. You don't have to take our word for it; there have been several scientific studies to test the so-called abilities of psychic detectives over the years, generally by having a group of regular people compete against them. To the surprise of no one but people who believe in psychics, regular Joes and supernatural seers perform the same -- almost as if they were all just making guesses based on the information given to them.
"Yes ... I am sensing that people take advantage of you ..."