s ▁dis gu ised ▁voice . ▁Hoff man ▁attacks ▁Er ick son ▁and ▁Pere z , ▁uses ▁the ▁techn ician ▁as ▁a ▁shield ▁against ▁Pere z ' ▁gun sh ots , ▁and ▁dem ands , ▁" Who ▁else ▁knows ▁about ▁me ?" ▁Pere z ▁says , ▁" Every one ," ▁before ▁Hoff man ▁finally ▁k ills ▁her . ▁He ▁then ▁sets ▁the ▁audio ▁lab ▁on ▁fire ▁to ▁destroy ▁the ▁evidence ▁and ▁finish ▁off ▁the ▁three ▁vict ims , ▁plant ing ▁Stra hm ' s ▁finger print s ▁around ▁the ▁room ▁to ▁keep ▁susp icion ▁from ▁himself . ▁ ▁The ▁contents ▁of ▁Am anda ' s ▁letter ▁( as ▁seen ▁in ▁S aw ▁III ▁and ▁S aw ▁IV ) ▁are ▁shown ▁in ▁a ▁flash back , ▁which ▁explains ▁that ▁Hoff man ▁had ▁discovered ▁that ▁when ▁Cec il ▁ro bb ed ▁J ill ' s ▁clin ic ▁for ▁dru gs , ▁he ▁was ▁not ▁acting ▁alone . ▁Am anda , ▁vis ibly ▁going ▁through ▁withdraw als ▁and ▁des perate ▁for ▁another ▁high , ▁press ured ▁Cec il ▁into ▁doing ▁so , ▁she ▁in ad vert ently ▁caused ▁J ill ▁to ▁mis car ry ▁her ▁and ▁John ' s ▁un born ▁child , ▁G ide on . ▁In ▁the ▁letter , ▁Hoff man ▁black ma iled ▁Am anda ▁into ▁killing ▁Lyn n ▁Den lon , ▁telling ▁her ▁that ▁if ▁she ▁failed ▁to ▁do ▁so , ▁he ▁would ▁reve al ▁her ▁invol vement ▁in ▁J ill ' s ▁mis car riage ▁to ▁J igs aw . ▁Am