It depends on the fish that die;
I had two Clown Loaches die today, one I witnessed, he wouldn't leave my Oscar along. 5" Clown Loach pissing off a 13" Oscar, kinda had it coming. The Oscars also had a bit of a scuffle today, they knocked the end off my filter intake, this is where my second 6" dead Clown Loach was found. My brother found it, I was a work.
I will replace them, but not with ones the same size, I will probably buy 6 more, smaller ones and grow them to 5" then add them to my tank, that will make 10 all up.
I lost my GT pair a few weeks ago(9.5" Silver male and 6" Gold female), they will not be replaced, they can not be replaced in my mind.