ot ics ▁investig ator ▁and ▁retired ▁in ▁ 1 9 9 2 ▁as ▁an ▁Ass istant ▁Director . ▁He ▁is ▁now ▁employed ▁with ▁the ▁ag ency ▁as ▁a ▁full - time ▁for ens ic ▁special ist . ▁ ▁Pr att ' s ▁for ens ic ▁expert ise ▁has ▁contributed ▁to ▁many ▁high - profile ▁cases : ▁The ▁Green ▁River ▁K iller ▁( G ary ▁R idge way ), ▁Oklahoma ▁Girl ▁Sc out ▁Mur ders ▁( G ene ▁L ero y ▁Hart ), ▁Henry ▁Lee ▁Lucas ▁and ▁Ott is ▁To ole , ▁Bobby ▁Joe ▁Long , ▁The ▁I - 5 ▁K iller ▁( R and all ▁Wood field ), ▁Tommy ▁Ward ▁and ▁Karl ▁Font en ot , ▁Tommy ▁Lyn n ▁S ells , ▁World ▁Trade ▁Center ▁ 1 9 9 3 ▁bomb ings , ▁Ted ▁Bund y , ▁Sir lo in ▁Stock ade ▁Mur ders ▁( R og er ▁D ale ▁Staff ord , ▁V erna ▁Staff ord ▁and ▁Harold ▁Staff ord ), ▁Joe ▁Fischer , ▁Roger ▁Whe eler ▁murder , ▁the ▁Oklahoma ▁City ▁bomb ing ▁of ▁the ▁Alfred ▁P . ▁Mur rah ▁Federal ▁Building , ▁Donald ▁Eug ene ▁Web b , ▁Oklahoma ▁State ▁Fair ▁Ab duct ed ▁Girls ▁( Ro y ▁Russell ▁Long ), ▁and ▁Rand olph ▁D ial . ▁ ▁In ▁the ▁mid ▁ 1 9 8 0 s , ▁Pr att ▁developed ▁the ▁soft ▁t issue ▁post mort em ▁drawing ▁method . ▁Using ▁this ▁method , ▁the ▁for ens ic ▁artist ▁draw s ▁or ▁pain ts ▁on ▁the ▁photograph ▁of ▁a