It’s a Wonderful Afterlife(2010)

Mrs. Sethi, who is dying of cancer, is never found out about any of her murders or the manslaughter of next door neighbor Mrs Goldsmith (who she accidentally poisoned along with her dog).

Smythe (Mark Addy) figures out that Sethi’s somehow involved, but he gets stabbed in the groin with a pair of hedge clippers after he slips while she’s brandishing them.

Mrs. Sethi manages to get her daughter married before passing away in hospital, allowing all her victims (Smythe, Goldsmith, Manjeet Kahl, Mr. and Mrs Chakra and her daughter’s ex boyfriend) to finally, at long last, cross over into the after life