Responses
I am not sure if he knows the killer but I'm pretty sure he loves the mc and probably because they slept together his obsessive tendencies went haywire and he out they doing whatever the fuck he wants. It can also be possible that mc said something during on that night that triggered this side of prince
We all knew the prince was bat shit crazy, lets not freak out. Instead lets talk about his comment "I'll have you thrown in the gallows for harming a royal member". Could he be talking about the baby? Or could it be that its the dukes baby and hes mad jelly? Hmm