[matt_st3 (Strongrule)]

I'd say have him and the unid in the same screen to be safe but a lot of the times you are correct. I've seen a case through where I guy left the hall and the person inside was killed moments before someone walked past the first guy. Guy walking in sees body does math and kill the original guy. So it's situational, I check body times in that case.
I look at other death scenes around the time, but don't watch those scenes I fly over to the area I want to look at. Doing so I only have noire walking over my body after deag me in the head.