In the newly filed court documents, Sirhan's lawyers also repeated a previous assertion and presented reports from experts who said Sirhan was programmed through hypnosis to fire shots as a diversion for the real killer.
They added that sophisticated audio tests recently conducted on recordings from the assassination night show 13 shots from multiple guns were fired - five more than Sirhan could have fired from his small pistol.
Authorities have claimed eight bullets were fired, with three hitting Kennedy and the rest flying wildly around the kitchen and striking five other victims who survived.
Sirhan, now 67, a Palestinian immigrant, was denied parole after a hearing last March where he denied any memory of shooting Kennedy on June 5, 1968, moments after he claimed victory in the California presidential primary.
Parole officials said he doesn't understand the enormity of his crime that changed US history.
- HERALD ONLINE