[this list may not be comprehensive -- feel free to add]

Barry Jennings: Former New York Housing Authority Emergency Coordinator – reported that he and Michael Hess had been blown back by an explosion inside Building 7. He said in an interview he heard explosions in WTC 7 before collapse. He also said he was stepping over bodies, which contradicted the government claim that nobody died in Building 7. Shortly after appearing in a BBC documentary, On August 19th 2008, two days before the release of the NIST Final Report on the collapse of WTC 7, Jennings was found dead in his home with three bullet entrance wounds in the back of his head. The death was ruled a suicide.

Apparently Dylan Avery (the director of Loose Change) hired a private investigator to look into it, but without success: the Investigator referred the case to the police, refunded his fee to Dylan, and told him never to contact him again.

http://www.youtube.com/watch?v=x1dl0mC8Omo&t=24m30s

http://uspolitics.tribe.net/thread/e8c77e80-6911-4541-a6cc-9358a1ab120c

Video: http://www.youtube.com/watch?v=5LO5V2CJpzI

Jennings recanting 9/11 statements:

http://www.youtube.com/watch?v=vZbMfTtHkYM&feature=player_detailpage#t=2770s

Beverly Eckert: Lost her husband on 9/11. She was among the families organizing for disclosure and had filed suit against the House of Saud and the U.S. government. When she was offered money to stay silent, she refused. She died at age 57 in a commuter airplane crash on February 12, 2009. A week before he death she met with President Barack Obama as an advocate for those affected by 9/11.

http://abcnews.go.com/US/story?id=6870794&page=1#.T02DW3JSS_Y

Kenneth Johannemann – a janitor at the WTC complex, he reported seeing a massive explosions in the basement and upper floors of the twin towers. In September 2008 Kenneth died from a gunshot wound to the head – ruled a suicide.

http://articles.nydailynews.com/2008-09-03/local/17905673_1_cell-phone-cat-maya

Video: http://www.youtube.com/watch?v=egIrVyM3FGY

David Wherly Jr. – On 9/11 Wherley was the commander in charge of the 113th Fighter Wing at Andrews Air Force base, in Maryland. After 9/11 he took order from Secret Service to dispatch a fleet of aircrafts to protect the White House. He played a role in ordering the tactics used by the U.S. government in response to the terrorist activity. On June 22, 2009 Wherley and his wife Ann boarded a Red Line Washington metro and the train car he was in was rear-ended at high speed. Nine people died including Wherley and his wife. Deadliest crash in the history of the Washington Metro.

http://voices.washingtonpost.com/getthere/2009/06/victims_identities_coming_out.html

Milton William Cooper – United States Navy officer, author, conspiracy theorist, and radio talk-show host

At 11:40 pm, November 5 2001, Apache County Sheriff’s deputies attempted to serve an arrest warrant at Cooper’s residence. Cooper allegedly fired on police, and deputies returned fire, striking and fatally wounding Cooper.

http://freemasonry.bcy.ca/anti-masonry/cooper_m.html

William Cooper predicts 9/11:

www.youtube.com/watch?v=zrTjPGy2k_U

Prasanna Kalahasthi: Wife of 9/11 Flight 11 Passenger – suicide by hanging:

http://www.people.com/people/archive/article/0,,20136354,00.html

David Graham: 9/11 researcher and dentist who reported seeing three 9/11 hijackers with Pakistani businessmen in Shreveport, Louisiana – Died September 2006 – poisoned with anti-freeze.

http://www.ksla.com/global/story.asp?s=7229970

Paul Smith - flew the chopper in NYC for WABC-TV, as a news pilot. Run over (standing on the sidewalk) by a taxi-cab who swerved to avoid an unidentified black car.

http://911review.org/Media/helicopter_pilot_dead.html

Michael H. Doran – a 9/11 victims lawyer - killed in a plane crash.

http://doranandmurphy.com/our-attorneys/michael-h-doran/

Bertha Champagne: Longtime babysitter for Marvin Bush's family- Crushed to death by her own car in Marvin Bush’s driveway.

http://www.lookingglassnews.org/viewstory.php?storyid=3079

Christopher Landis: Former Operations Manager for Safety Service Patrol for the Virginia Department of Transportation, Interviewed by makers of “The Pentacon.” Gave filmmakers a photo collection which pertained to the Pentagon attack) – Died from suicide.

John P. O’Neill: FBI Counter-terrorism expert, who was obsessed with catching Osama Bin Laden. Suspected Clinton/Bush/FBI complicity in the cover-up and protection of Bin Laden. – He was transferred to a position in the WTC complex and died in the attack.

http://www.pbs.org/wgbh/pages/frontline/shows/knew/

Deborah Palfrey: Ran an escort service with 9/11 perpetrators as clients. A former NSA official noted that some of Palfrey’s call girls were being chauffeured by Sherlington Limousines to poker parties attended by former CIA director and co-chair of the Joint 9/11 Intelligence Inquiry Porter Goss. – Suicide by hanging.

http://abcnews.go.com/Blotter/story?id=4788703&page=1#.T02UTHJSS_Y

Suzanne Jovin – Yale student who wrote a thesis about Osama Bin Laden. Stabbed to death by unknown suspect.

http://topics.nytimes.com/topics/reference/timestopics/people/j/suzanne_jovin/index.html

Perry Kucinich – Brother of Congressman who advocated new 9/11 investigation – allegedly fell to his death.

http://blog.cleveland.com/openers/2007/12/perry_kucinich_younger_brother.html

Salvatore Princiotta – 9/11 FDNY Firefighter from Ladder 9 – Murdered -

http://www.slideshare.net/VogelDenise/princiotta-salvatore-news-article-ofdeath-911firefighter-11709069

Ezra Harel: Chairman of the Israeli Company That Handled Security for all 9/11 Airports – Died from a heart attack.

http://www.haaretz.com/print-edition/business/ezra-harel-dies-of-heart-attack-1.106796

Bruce Ivins – Respected Army Scientist linked to 9/11 “Anthrax” case – suicide from overdose.

http://www.msnbc.msn.com/id/25961053/ns/

Thanks to everyone who helped compile this list, with lots of credit going to Malizulu.