Mystery deepens over disappearance of Bristol man after new study dismisses leading theory

Theory Briefing

• Jack O'Sullivan vanished in Bristol over two years ago, and no confirmed trace of him has been found since.
• A newly published study directly challenges the leading police theory, leaving investigators without a clear explanation.
• With the dominant theory now in doubt, competing explanations for his disappearance are back on the table.
• The case highlights how forensic or investigative assumptions can shape — and potentially narrow — a missing-persons inquiry.