His cause of death was an accidental overdose from 6-7 different prescription drugs. The list and names can be found easily via a search. Most were anxiety drugs, as well as Lortab and whatever the antihistamine was that's in Nyquil. That doesn't mean he took all of these at once and then croaked. It just means that all were found in his blood. These drugs stay in your system and may have taken them here and there over the course of a few hours time but too close to one another. I'm not sure why he took so many different anti-anxiety medications, though. They all do the exact thing, so he really only needed one. The only real difference would be their efficacy.
Oh yeah, the use of the expression "dead bang" is one I've used a few times on here. I stole it from Eric Draven from The Crow.
Anyway, TDK has a shot at the title meaning beating the all time biggest opening weekend. It pulled in 18.5 million from the midnight showing (and in ~1,000 less theaters than the regular run will play in...the amount of theaters this movie is playing in is also a record as is the number of IMAX screens) besting Episode III's 16.9 million. If it does beat the all-time record this will be even more impressive given it's 2.5 hours long.
One last thing, if any of you wanting to see this have small children, you may want to reconsider taking them. It's rated PG-13 in the US, but it's a very hard PG-13. I'm surprised it didn't get an R even in its current form. If it had a bunch of language or much blood it might have. Actually, there is one scene that has been altered, and most likely via CGI, because of a ratings glitch. I won't say what it is but it involves a pin or safety pin (can't recall which). There's an older leaked image out there of this shot, and instead of a pin it's a knife. Christopher Nolan didn't reshoot anything (he never does), so it had to be changed in post production.

