SAN DIEGO — For the 15th time, officials denied parole for Sirhan Sirhan, the assassin of Senator Robert F. Kennedy, after hearing Wednesday from another person who was shot that night and called for Sirhan’s release.

The decision came after Sirhan answered questions from the California parole panel for about three hours in a windowless conference room.

Commissioners said Sirhan did not show adequate remorse or understand the enormity of his crime.

‘‘This crime impacted the nation, and I daresay it impacted the world,’’ commissioner Brian Roberts said.

During the hearing, the 71-year-old Sirhan stuck to his previous account that he did not remember the shooting in 1968 at the Ambassador Hotel in Los Angeles after Kennedy won the Democratic presidential primary in California.

He said he recalled being in the hotel then going to his car and returning after realizing he had too much to drink. He said he became interested in a female and they drank coffee in a hotel pantry.

‘‘It’s all vague now,’’ Sirhan told the parole panel. ‘‘I’m sure you all have it in your records, I can’t deny it or confirm it, I just wish this whole thing had never taken place.’’

Paul Schrade, 91, told the panel that he believes Sirhan shot him at the hotel but an unidentified second shooter killed Kennedy. Schrade was a Kennedy confidante and one of five people injured in the shooting.

Schrade pleaded for the release of Sirhan at the hearing and apologized for not doing more over the years to secure his freedom.