SAN DIEGO — For nearly 50 years, Sirhan Sirhan has been consistent: He says he doesn’t remember fatally shooting Sen. Robert F. Kennedy in a crowded kitchen pantry of the Ambassador Hotel in Los Angeles.

The Jerusalem native, now 71, has given no inkling that he will change his version of events at his 15th parole hearing on Wednesday in San Diego. He is serving a life sentence that was commuted from death when the California Supreme Court briefly outlawed capital punishment in 1972.

During his previous parole hearing in 2011, Sirhan told officials about his regret but again said he could not remember the events of June 5, 1968. The parole board ruled that Sirhan hadn’t shown sufficient remorse and didn’t understand the enormity of the crime less than five years after the killing of President John F. Kennedy — the senator’s older brother — and two months after the assassination of Martin Luther King Jr.

His memory will be tested this time in front of Paul Schrade, 91, a Kennedy confidante who was one of five people injured in the shooting. Schrade will appear for the first time at a Sirhan parole hearing.

Schrade, who declined in a brief interview to preview his planned remarks to the parole board, has steadfastly advanced the view that there was more than one gunman.

Sirhan initially refused to appear at the parole hearing at the Richard J. Donovan Correctional Facility, where he has been held since 2013, said Laurie Dusek one of his attorneys. Memories of the 2011 hearing made him physically ill, but Sirhan relented after Dusek begged him to come and said Schrade would be there.