Steven Crowder Reenacts George Floyd Killing to Test “Knee on Neck” Theory Infowars.com Comedian did not, however, take three-and-a-half times the lethal amount of fentanyl. Image Credit: Email Comedian Steven Crowder reenacted the death of George Floyd Wednesday, attempting to test the prosecution’s theory that a person’s knee on his back caused the death. The prosecution’s case in the ongoing murder trial against former Officer Derrick Chauvin depends heavily on proving he knelt on Floyd’s neck hard enough to cause asphyxiation. Crowder tested the theory live for a second time on his show Wednesday, this time having his producer kneel on his neck for 9 minutes on concrete instead of carpet.