Ballads in general are full of this sort of thing. Perhaps the most horrifying of the lot is "Long Lankin" (Child #93), in which an itinerant serial killer murders a lord's baby (spectacularly averting Infant Immortality in the process) and then his wife:
"We will pinch him, we will prick him,
we will stab him with a pin,
And the nurse shall hold the basin
for the blood all to run in."
So they pinched him and they pricked him,
then they stabbed him with a pin,
And the false nurse held the basin
for the blood all to run in.
- Followed by Long Lankin being hanged and the nurse being burned on a pyre at the end of the song.