|Click for a bigger version.|
Lastly, for a quick at-a-glance summary, you can bring up a graph of the person's HP made from the data shown in the Death Details window by clicking on the Show Graph button in the lower-right. The Death Graph can be used to quickly see whether to blame the healers or not. If they went from full-to-dead in less than about 2 seconds, then it's not reasonable to think any healer could have responded. Similarly, if they were receiving a lot of heals, but died anyway, there's still nothing more the healers could have done.
One common complaint I hear from new healers is that they get blamed for any and all deaths (even when, as the healer, they know there was no way for them to fix some of the deaths.) By proper use of the Death log, you can not only figure out what went wrong on your wipes, so as to fix it, but you will also begin to see that in most cases the healers are not why someone died. I hope that eventually blaming the healer won't be the default stance for anyone who dies, and fewer new healers will be scared away from the role.