lol yup i agree Deadman Wonderland is the BEST bloody Anime i ahve ever seen, *psst* i know a good site that has it englishes dubbed go to www.englishanimes.com and type in deadman wonderland in the cerca box ^.^
I agree with Viktoriya on this, try the Blood series. Though I suggest the Blood-C (the sequel of Blood+). It is really... um... look for yourself --> link It's a .gif from the Blood-C series. Hope that... Suits your taste...
Another is a pretty good Anime with quite a lot of deaths. and it only has 12/13 episodes, the last two in my opinion had the most violence and blood. but yeah all throughout there are lots of deaths.. and it has a really awesome storyline :D