Donna betrays Harold Smith
‘The Orchid’s Curse,’ Episode 205

Donna and Maddy trick shut-in Harold Smith (Lenny Von Dohlen) so they can steal Laura’s diary from the secret compartment in his bookcase. Harold catches them and flies into a rage, raking a three-tined garden cultivator down his face and screaming at them to get out. He later kills himself. Watching Donna so easily manipulate someone so sweet and gentle (someone she obviously comes to care for) is plenty disturbing by itself, but it becomes even more so after his breakdown.