He died in the September 11, 2001 Terrorist Attack on board United Airlines flight 93.
When the hijackers took control of the flight Jeremy called his wife Liz who connected him by conference call to the 911 system. Jeremy relayed to the police what was happening as the hijacking unfolded. As his wife listened, Jeremy told the police there were three Arab terrorists with knives and a large red box that they claimed contained a bomb.
After several minutes of relaying details of the scene, Jeremy decided with two other passengers that there was nothing to lose by rushing the hijackers.
Jeremy is survived by his wife Lyzbeth Glick and their 12-week-old daughter, Emerson.
See September 11, 2001 Terrorist Attack/Casualties.
Note that there is another Jeremy Glick, whose father, Barry Glick, also perished in the September 11, 2001 Terrorist Attack. This Jeremy Glick co-authored a book entitled "Another World is Possible", and has been at outspoken opponent of the military response to September 11.