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Robert F. Kennedy's assassin will seek parole for the 15th time Wednesday morning — almost 48 years after he shot and killed the Democratic senator for New York.

Kennedy was shot on June 5, 1968, at the Ambassador Hotel in Los Angeles just after he'd won the state's Democratic presidential primary. The younger brother of President John F. Kennedy died the next day.

Sirhan Sirhan at his last parole hearing in Coalinga, California, in March 2011. Ben Margot / AP

Sirhan B. Sirhan, a Christian-born Palestinian from Jordan who opposed Kennedy's support for Israel, was wrestled to the ground with a gun in his hand and later convicted of the killing. He was sentenced to death, but the sentence was commuted to life in prison after California banned the death penalty.

Sirhan, now 71, has said for many years that he doesn't remember shooting Kennedy, who was 42.

At his last parole hearing in 2011 — his 13th unsuccessful attempt to win his freedom — parole commissioners said Sirhan hadn't shown enough remorse for or understanding of the severity of his crime.

Sirhan is serving his life sentence at a prison in San Diego, where he was moved on Nov. 22, 2013 — the 50th anniversary of John Kennedy's assassination. State prison officials said the timing was a coincidence.