Yep, you definitely killed your yeast by adding it with your almost boiling wort. A few other things, too. Without more details about your process I might be off here, so ignore the following if you are already doing this.......I wouldn't recommend using ice in the wort as it can contain bacteria. Using it in the water bath to cool your container is okay, but don't put it in the wort. Also, be careful about pouring hot wort into a cold glass carboy (even with cold water in it). The temperature change can shatter the carboy. Better to cool it down in your brew kettle then rack it into the cold water (or put cold water into wort, then transfer to carboy). Anyway, we all make mistakes. Don't worry and keep at it, you will be brewing good beer soon!!