pratt had an alibi. he names the men that he thinks actually did commit the murder. >> the two people who we think are the real killers of mrs. olson are larry hatter and herb et cetera swilly who were fringe members. they would attend black panther party affairs when it suited their own purposes. >> hatter and swilly are both dead. these declarations from four men who grew up in south la with swilly and hatter claim that the two men told them they had done the tennis court robbery and murder. we are not revealing the names of these men to protect their identities. this declaration is from one of the four. he was actually arrested for the tennis court murder but then released, long before pratt was charged. the man claims he told the lapd detectives that hatter and swilly said "they had been at the tennis court" and described a man and woman on the tennis court shaking in fear and crying just before they were shot.." the declaration goes on to say that detectives: "told me not to discuss this with anyone if i knew what was good for me.." these are police composite sketches of the two killers based on descriptions from the dead woman's wounde