Just leave it in there, if its not gone in 1-2 days, what I do is try to fan water around. Get a powerhead, plug it in, and guide the powerhead so it blows the water where you want it to blow. Just blow it towards a spot in the tank that you can get access to easier.
One way that I search for dead shrimps is take a chop stick, do a swirling motion in the tank. If its dead, the swirling motion will cause it to drift for a second. This is something different though so just read the first paragraph. Too late now I bet you've already read this one
