Sorry, Poisonous Shroom, I noticed that you wanted to join after I wrote the entire episode and tried to add you in at the last second and must've missed that one detail. xD Sorry, I'll try to not do that as often.
Also, MintyOtter, if you want to debut it some kind of mystery twist, then just og back to the Whodunnit Sign-Ups and create a character. Title the scene "For Whodunnit". I mean, if you wanna debut. It's completely your choice.
I think that Bubble, when investigating the kitchen, poisened Blocky's sandwhich. He went on with his day like natural, but eventually became sick and had to go to the bathroom. When he went to the bathroom, somehow he puked and ran into the kitchen and eventually died. Maybe the stains in the Kitchen was actually puke and not pee. Then, Bubble, after her meeting with Match and Pencil carried him to the Kitchen and pinned him to the wall with the butchers knives. Then, she snuck back into the group as if nothing had happened.