First you need to make a hud with your desired text on it and then use this as the characters destroy script:
;Artificial Intelligence Script
;Header
desc = Fade Out Disappear and display hud
;Triggers
:state=0:hudreset,hudx=50,hudy=90,hudimagefine=YOURHUDNAME.tga,hudname=killed,hudhide=1,hudmake=display
:state=0:state=1
:state=1,alphafadeequal=100:decalphafade=0
:state=1,alphafadeequal=0:state=2
:state=1:hudshow=killed,timerstart
:state=2,timergreater=5000:hudunshow=killed
;End of Script
Not tested it but I'm pretty sure it will work.