Who killed gumball

this is my gumball au please don't forget this au is gonna be on tiktok soon so here's the lore yeah basically in this AU Gumball is dead but it happened when Darwin was at school and Gumball was suspended for 5 days basically Gumball went out for a walk but when he stepped on the road he couldn't move his left leg and he saw that there was black sticky stuff on the road and he sat there for 17 minutes total but he heard a car behind him and when he turned around there was a car coming and he panicked so he tried get out of the sticky stuff but failed and got hit by the car ripping half his body apart and was barely able to breathe enough oxygen that he had to take a breathe every second literally and he went on like that for 3 hours and in 2 hours Darwin was out of school waiting to tell the adventure to Gumball but when he came home and opened the door he was surprised to see that Gumball wasn't home so he asked Mr. Dad/Richard where was Gumball and Richard said that Gumball had taken a walk, thinking, Darwin decided to check all around the area and when he was looking he heard something breathing underneath him and he then stepped on blood and he looked down to see Gumball trying to survive, Darwin was shocked so he gave Gumball a hug before Gumball died in a nice hug.