The echo command litterally echoes. When you type a message behind the echo command, it will show up in your console and in your obituary list (kills&deaths).
So if you create a bind or script containing:
echo “I want this text to display in my obituary list”
It will pop up there as soon as it’s launched.
Make sure your settings of the mod (etpro, jaymod etc) are set so they don’t delay the obituaries