Sneha Anne Philip (9/11)

Dr. Sneha Anne Philip, a 31-year-old internist, was last definitively seen on September 10, 2001, at a Century 21 department store near the World Trade Center in Lower Manhattan. She did not return to her apartment at 1 Batavia Place that night.

The next day, September 11, 2001, the World Trade Center was attacked. Sneha's apartment was in the immediate vicinity of the towers. Her family believes she may have rushed to help victims as a physician and was killed in the collapse.

However, investigators noted that Sneha had been dealing with personal problems—she had recently been suspended from her residency program and was facing disciplinary action. Some investigators theorized she may have disappeared before the attacks for personal reasons.

After years of legal battles, Sneha was added to the official list of 9/11 victims in 2008. Her case remains ambiguous—it is unknown whether she died in the attacks, was a victim of foul play on September 10, or voluntarily disappeared.