Most organs are high in cholesterol, but for diet purposes consider the heart to be a muscle.... a very healthy muscle. If there is a part of the deer with less cholesterol I’m not aware of it.
Cube it up, throw it in the crock pot with a bag of soup/stew veggies, add a 2-3 cans of Campbell’s condensed(no water) Cream of mushroom/tomato/celery/whatever.... (low sodium if you like) and just go away for 8+ hours
edit....
maybe not??? checked a few links for specifics and the psu one specifically lists deer heart as up there on the cholesterol list. Find it hard to believe bambi has more cholesterol than pork or bear but Penn State says so.
http://www.gunnersden.com/index.htm....ion-value.html
http://ces.uwyo.edu/PUBS/B920R.PDF
http://aginfo.psu.edu/News/2000/12/game.html