The decision came yesterday after Sirhan answered questions from the parole panel for about three hours in a small, windowless conference room.
Sirhan stuck to his previous account that he did not remember the shooting in 1968 at the Ambassador Hotel in Los Angeles.
He said he recalled being in the hotel then going to his car and returning after realising he had too much to drink. He said he became interested in a female as he drank coffee.
Schrade was a Kennedy confidante who was one of five people injured in the shooting after Kennedy won the Democratic presidential primary in California.