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South Africa ' s Supreme Court of Appeal ruled Tuesday against a state request to retry the head of apartheid ' s germ warfare program , once accused of plotting to poison Nelson Mandela .
 ( trial hearing: retry,  Supreme Court of Appeal: adjudicator, head: defendant) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: declare bankruptcy, transfer ownership, transfer money, marry, transport, die, phone write, arrest jail, convict, sentence, sue, end organization, start organization, end position, start position, meet, elect, attack, injure, born, fine, release parole, charge indict, extradite, trial hearing, demonstrate, divorce, nominate, appeal, pardon, execute, acquit, merge organization, Arguments type: beneficiary, prosecutor, plaintiff, seller, victim, buyer, agent, destination, artifact, organization, recipient, person, place, origin, target, giver, adjudicator, attacker, vehicle, defendant, entity, instrument. 
Text: {0} 
Answer:
 ( trial hearing: retry,  Supreme Court of Appeal: adjudicator, head: defendant) 