November 26, 2006 -- O.J. SIMPSON didhave an accomplice in the murders a criminal jury said he didn't commit - it was Prozac. That's according to Mike Gilbert, a sports agent and longtime pal of Simpson, who says the ex-grid great was flying high on not one, but two prescriptions of the mood-altering drug at the time of the grisly 1994 killings. "O.J. is very much out of his mind . . . [which] was complicated by the Prozac," says Gilbert, who adds that Simpson continued wolfing down the drug to help him withstand the pressure as cops put the heat on him. He believes Simpson's disassociative state from Prozac allowed him to murder and avoid cracking. Over the years, the drug has been blamed for sparking murderous and psychotic behavior. In the wake of Simpson's sickening attempt to cash in with a book, "If I Did It," and TV special, both now shelved, Gilbert fumes: "I can't forgive him for the way he has conducted himself since [the murders]. He's the kind of guy who, were he on the Titanic, would have taken two life preservers for himself and watched his kids drown."