Fort Hood Massacre: The Investigation into the Fatal Shootings - ABC News

VIDEO: Maj. Hasan Belived His Patients Were Guilty of War Crimes

'War Crimes' Set Off Fort Hood...

VIDEO: Nidal Malik Hasan frequented strip club and shooting range before shootings.

Fort Hood Shooter Before the...

VIDEO: Background check on Maj. Malik Hasan wasn't shared with terrorism officials.

How Did the Fort Hood Killer Get a...

VIDEO: Hasan labeled himself a soldier of Allah

Hasan Labeled Himself 'Soldier of...

VIDEO: How alleged Fort Hood shooter bought a gun

How Did Fort Hood Shooter Get the...

VIDEO: Inside the Mind of Shooter Major Nidal Hasan

Inside the Mind of Suspected...

VIDEO: Major Hasan refuses to speak to police

Maj. Hasan Refuses to Speak to...

Warning Signs

Fort Hood Shooting Warning Signs

VIDEO: Hasan reached out to al Qaeda

Warning Sign: Hasan Reached Out to...

VIDEO: Fort Hood Suspect's Ties to Terrorists

Fort Hood Suspect's Ties to...

What Turned Major Into Alleged Killer?

What Turned Major Into Alleged...

VIDEO: Who Is the Alleged Ft. Hood Shooter?

Who Is the Alleged Fort Hood...

FORT HOOD MASSACRE

Lawyer for Fort Hood Shooter Will Explore Mental Responsibility Issue

The Army Asks If Major Nidal Hasan Is Insane

Photo: Seven Soldiers Killed, 20 Wounded in Fort Hood Shooting: One Suspect in Custody, Search Is on for Second Shooter

Hasan Won't Plead Guilty, May Use Insanity Defense

Photo: Accused Fort Hood Shooter Court Hearing In Hospital

Defense Attorney: Hasan Is Paralyzed From the Chest Down

Fort Hood: Hasan Asked Awlaki If It Was Okay to Kill American Soldiers

Hasan Permanently Paralyzed

Major Hasan Dined with 'Jihad Hobbyist'

Army Major Hasan Faces New Charges in Fort Hood Shootings

How Anwar Awlaki Got Away

Pentagon Probe Leaders Visit Fort Hood to Begin Investigation

'Can't Wait': Hasan's E-Mail About Afterlife

Pentagon, Senate Launch Fort Hood Investigations

Hasan Was Worried About Results of Recent HIV Test

Accused Fort Hood Shooter Was a Regular at Shooting Range, Strip Club

Muslim Leader: Anwar al Awlaki Admired by 'Gangster Youth' Including Toronto 18

Major Hasan: Soldier of Allah; Many Ties to Jihad Web Sites

The Private Life of Nidal Hasan

From Yemen, Anwar Awlaki Helped Inspire Fort Dix, Toronto Plots

Senior Official: More Hasan Ties to People Under Investigation by FBI

Al Qaeda Recruiter New Focus in Fort Hood Killings Investigation

FBI Agents Search Trash At Mosque Attended by Hasan

Hasan Warned Army of "Adverse Events" if Muslims Not Released

Officials: Army Told of Hasan's Contacts with al Qaeda

Officials: Major Hasan Sought 'War Crimes' Prosecution of U.S. Soldiers

'Cop Killer' Gun Used In Ft. Hood Shooting, Officials Said

Hasan's Pistol May Be Linked To 'Guns Galore' Shop in Texas

Nidal Malik Hasan, Suspected Fort Hood Shooter, Was Called "Camel Jockey"

WATCH: Inside the Home of Nidal Hasan

WATCH: Leader Wants to Rehabilitate 'Misguided' Youth

PHOTOS: Inside the Investigation into the Fort Hood Shootings

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Blotter Team

Chief Investigative Correspondent: Brian Ross
Chief Investigative Producer: Rhonda Schwartz
Editor: Lee Ferran
Washington D.C.: Matthew Mosk and James Gordon Meek
Chicago: Stephanie Zimmermann, The ABC News Fixer
New York: Josh Margolin, Aaron Katersky, Cindy Galli, Megan Chuchmach, Ned Berkowitz, Randy Kreider, Rym Momtaz