Pronouciation help

[blueyeti.livejournal.com]

Hi

I'm working on an audio production of a Doctor Who fanfic, and I've tried in-fandom resources with little success. I need to pronouce Koschei, as in Koschei the Deathless, and my only pronouciation help has been a Czech girl who can't remember her Russian.

I'm english language only, unfortunately, so a phonetic pronouciation or link to an audio file would be most helpful.

Thanks,
Yeti