Reasons:
1. Only Henry has the opportunity to plan a mass murder through a wedding. Many of the details of the murder plan are related to the wedding event's schedule.
2. After discovering JD, Trish once asked Henry what the scar on his body was, and his answer was vague, probably a foreshadowing.
3. Henry did not act alone every time he found the body. The witnesses who were with him were actually arranged by him. This is very important in inferring the murderer. His only solo discovery was in a church where he found the animal carcass that JD had pranked on, but his real purpose at the time was actually to confirm the mechanism on the chandelier.
4. Trish's father said on the day he died that he didn't trust Henry, the second foreshadowing.
5. The rest is intuition. I've been suspicious of him since episode 4, his anger and sadness is like acting every time, and his sunny smile all day long is especially suspicious. Remember in episode 1 when their waiting cousin Ben was strapped under the propeller? At that time Henry said he would wait a little longer, and Trish decided to leave the boat and wait no longer. Henry was actually acting on purpose. in addition. The murderer at the end of the play is Henry's most shocking result. No matter how you look at it, everyone else looks like a supporting role, and it is impossible to take on the important role of a new serial killer.
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