Lee, retired from Connecticut's Department of Public Safety, emphasized he would not lead the investigation into the attacks on President Chen Shui-bian and Vice President Annette Lu on March 19, the Taipei Times reported Saturday.
"I only came back to provide forensic analysis to assist local investigators. That is all," said Lee, who grew up in Taiwan.
Lee met with Chen Shui-bian at the Presidential Office Friday and said Chen had suffered a "fresh" bullet wound to his stomach.
"Our conversation lasted for half an hour and I confirmed that he got a fresh wound on his stomach and the wound was caused by a gunshot," Lee said at a news conference at the National Police Administration's Criminal Investigation Bureau.
Lee said he could not comment further because of a gag order on the case.