William would still be alive in the film Saw Vl had he stood near Pamela .
A videotape informs Tara that she can choose to kill William or set him free using a marked switch ; when Tara can not bring herself to do so , Brent readily shifts the switch to `` Die '' and William is killed when a platform of needles swings into his back and pumps hydrofluoric acid into his body , rending his flesh and splitting his body in half .
Saw VI