Carl Smith collided with a concrete lamp-post while skating and suffered a skull fracture that caused a coma. When he failed to regain consciousness, his parents on August 8 consented to his life support machine being turned off.
A collision with a concrete post can cause a skull fracture.
( z1 possible :ARG1 ( z2 cause :ARG0 ( z3 collide :ARG1 ( z4 post :ARG1-of ( z5 concrete ) ) ) :ARG1 ( z6 fracture :ARG0 z3 :ARG1 ( z7 skull ) ) ) )