Hi,
What a honest song. I like that. Sometimes as writers there is a temptation to try and over complicate things or make them too clever. This has some sheer honesty about it.
The chorus is really good, especially the second half;
But it's the people you love who kill you first,
Left alone unable to talk,
I will when the dead can walk
I too like the (When) Dead Can Walk title. Says what you are feeling.
Don't know what you have planned musically, but exposed vocal like Lennon singing "Mother" would be great. Or perhaps something dark and grungy.
Hope you and yours are okay.
All the best,
Digger