Here's what we know, based on tweets from audience members, a comprehensive police scanner timeline on Reddit and media reports.
11:37 p.m.: Jessica Ghawi sends her last tweet from the movie theater. She was later confirmed dead by a friend on Twitter.
@jessespector MOVIE DOESN'T START FOR 20 MINUTES
@jessespector MOVIE DOESN'T START FOR 20 MINUTES-- Jessica Redfield
11:45 p.m.: Rachel Fedeli, who was in the auditorium next door to the theater where the shooter attacked, also tweeted her excitement.
Midnight showing of The Dark Knight Rises with the best friends. :)
Midnight showing of The Dark Knight Rises with the best friends. :)-- Rachel Fedeli
Around 12:30 a.m.: Witnesses say the gunman, dressed all in black and wearing a gas mask, released tear gas and opened fire as soon as Batman first appeared on screen.
Around 12:30 a.m.: Bullets come through the walls of the theater next door — Fedeli's theater.
Our theater: bullets came through the walls and hit some people in our theater, and smoke bombs were thrown into our theater.
Our theater: bullets came through the walls and hit some people in our theater, and smoke bombs were thrown into our theater.-- Rachel Fedeli
Around 12:30 a.m.: Amid the chaos, many were blocked from leaving the theater, where the suspect was believed to be still at large.
I have never been more scared then the moments where we were all trapped in the theater, helpless. Unable to get out at all.
I have never been more scared then the moments where we were all trapped in the theater, helpless. Unable to get out at all.-- Rachel Fedeli
Around 12:45 a.m.: Outside the theater, even more chaos. People walk out splattered in blood.
Around 12:45 a.m.: Frantic 911 calls come in. Police try to piece together what happened.
1:27 a.m.: Overheard on the police scanner: "Bring as much crime scene tape as you can."
1:41 a.m.: First media reports emerge from 9news.
1:40 a.m.: 18 ambulances are on the scene, transporting victims to Denver Health. Ten people would die at the theater, while two would die at the hospital.
1:43 a.m.: Reports of a bomb going off in the theater. Bomb squad is onsite with K-9 units.
UPDATE: The Denver Post has created a Google Map of notable locations involved with the shooting
