Rudy Guede, the Ivory Coast immigrant who was given a 30-year sentence in October for the murder of British student Meredith Kercher in Italy, declined to answer questions Saturday when he appeared in court at the trial of jailed American Amanda Knox and Raffaele Sollecito, who are also accused of taking part in the killing.
The prosecution in the case had hoped that Guede would shed light on what really happened on the night of Nov. 1, 2007, when Kercher was sexually assaulted, stabbed in the throat and strangled.
However he took the witness stand to tell the judge, Giancarlo Massei, that he would "exercise my right not to respond."
Guede, a drifter who came to Perugia as a boy and was adopted by a local family, spoke in Italian. He did not look at either Knox or Sollecito.
Guede maintains that he made a date with Kercher, an exchange student from Leeds University, but that they had "incomplete" sexual relations before he went to the bathroom with stomach pains because of eating a spicy kebab.
He has told investigators he was in the bathroom with his iPod, and emerged to find a man with a knife with whom he scuffled.
He has indicated that the man resembled Sollecito, and that Knox was also present. He went to a Perugia nightclub after the murder but then fled to Germany.