Sharona: How did she do it?
Adrian Monk: Allergies. Hal Duncan had lots of allergies. The wardrobe lady said he was afraid to eat anything he didn't make himself. That's why Jenna wanted him in that part. He was the perfect patsy! The prop master told me that Jenna was hanging out onstage before the show. But she wasn't switching knives, she was tampering with the apples.
Sharona: The apples?
Adrian Monk: She must have been putting something on them or in them something that Hal Duncan was allergic to.
Sharona: That's right. My mom said they tasted funny.
Adrian Monk: Hal Duncan wasn't stabbed. He was having an allergic reaction.
Sharona: But he was stabbed. There was a real knife in his chest.
Adrian Monk: I know. I-I know, I know. It was a brilliant plan.