"That's a pretty inaccurate statement, because nobody at this stage can be ruled out of the inquiry," Shields said.
Police have so far failed to reveal any significant breakthroughs as they hunt for Woolmer's killer or killers, and on Tuesday made an international appeal for witnesses to come forward.
Detectives were trying to track down anyone who stayed or visited the hotel in the days leading up to Woolmer's death, Shields said.
"What I need to do is to identify everybody in the hotel from Friday through to Sunday when Bob's body was found, in an effort to establish everybody's movements during that period of time," he told reporters. "Not just as suspects but as potential witnesses -- people who may have heard something, seen something within the hotel that raised their suspicions, that so far they haven't come forward with."
Shields urged any cricket fans or tourists who had since returned to their home countries to dial the international hotline or contact their local police.
The new appeal comes amid speculation that the trail has gone cold, and may take months or even years to resolve.
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