Varner, Arkansas — The state of Arkansas executes its fourth inmate in eight days.
A prison spokesman says condemned inmate Kenneth Williams shook for approximately 10 seconds about three minutes after his lethal injection began Thursday night.
Williams was pronounced dead at 11:05 p.m.
Department of Correction spokesman Solomon Graves did not provide any details about the shaking.
Media witnesses have not yet returned from the death chamber.
The state has now wrapped up an accelerated schedule of lethal injections that was set to beat the expiration date of one of the drugs.