How fast does a pumpkin have to go to kill someone?

in my class we read "The Legend of Sleepy Hollow" and my teacher decided to turn it into like a type of trial because at the end of the story they said they suspected Brom Bones of killing Ichabod Crane. my role in the trial is like to be one of the other witnesses. a doctor witness. i may have to answer the question above. i also want to know how fast does a pumpkin have to go to splatter all over the ground. thanks!