There's a small but growing segment of my incoming queries that might be thought of as zombie queries, but the writers aren't un-dead; they're just dead.
Sadly, writers sometimes pass away before they see their work published. Their loved ones are moved to follow up, often to honor their loved one's memory. I understand their motivation and I wish I didn't have to disappoint them.
It's harder to get published when you're dead. That's just a cold hard (sorry) fact.
For starters: you're not here to do the editing or revising. You're not here to do the promotions. And more important, you're not here to write/edit/revise/promote the next book.
For friends and families who want to see their loved ones published, I think this is a good match with some of the more reputable places that will help you publish a book on your own. Print on demand technology makes it affordable too.
Someone is sure to point out that John Kennedy Toole and CONFEDERACY OF DUNCES was published posthumously. Yes there are exceptions, of course, but please let's all remember that book was published decades ago, by a university press and long before trade publishing became the mercantile meat wagon it is today.
Someone is also sure to point out that VC Andrews has had a very nice career, post life, but the first books were published pre-death, so again, that is an exception.
I always feel bad sending form rejections on these queries, it's not anywhere near as much fun as kicking kittens, but there's not much else to do.