
Deadly Misunderstanding - S7-E2
Revealing mistake: In the shot where Ralph lies dead, the padding used to accommodate the stabbed scissors protrudes under his shirt.

Revealing mistake: When Jessica enters the mortuary, the background is a blatant painted backdrop.






Answer: In a flashback scene, it was shown that he had a violent temper, so it stands to reason that he finally killed her in a fit of rage.