There is solid evidence which indicates that the murder of RFK was a conspiracy. Attorney and Barrister, Dr. William Pepper, is currently working to obtain the release of Sirhan Sirhan.

Dr. William Pepper, the author of An Act of State: The Execution of Martin Luther KIng, carried on a 30 year investigation that resulted in a Memphis jury exonerating James Earl Ray in 1999 and implicating the DOD,CIA,FBI and organized crime.

From today's NYDaily News Today
Looking to reopen Robert F. Kennedy murder, 40 years later

Recent articles:

Did Sirhan Sirhan Act Alone?
WBZ TV (CBS) - June 5, 2008
Forensic Scientists: More Than 1 Gunman Involved In RFK Killing

New evidence suggests second shooter killed RFK
Rawstory (MSNBC Video) - Wednesday March 26, 2008
Forty years after Democratic rising star Robert F. Kennedy was killed at a Los Angeles hotel during his presidential run, new evidence suggests the man serving a life sentence for his murder did not fire the shots that killed the charismatic senator.

Who shot Bobby Kennedy?
BBC Newsnight | November 21, 2006
Film-maker Shane O'Sullivan has uncovered new footage showing that at least three CIA agents were present on the night Robert Kennedy was murdered.