▁doctor ") ▁in ▁a ▁ 1 9 8 9 ▁episode ▁of ▁P ee - we e ' s ▁Play house . ▁Fox ▁was ▁the ▁pen ult imate ▁surv iving ▁adult ▁rec urr ing ▁cast ▁member ▁of ▁Bew itch ed , ▁leaving ▁Nancy ▁K ov ack ▁( who ▁port rayed ▁character ▁D arr in ▁Steph ens ' ▁ex - g irl friend ▁She ila ▁throughout ▁the ▁series ) ▁as ▁the ▁only ▁remaining ▁adult ▁cast ▁member ▁upon ▁his ▁death ; ▁child ▁actors ▁Er in ▁Mur phy ▁and ▁David ▁Lawrence , ▁who ▁port rayed ▁D arr in ▁and ▁Sam anth a ' s ▁children ▁( Tab ith a ▁and ▁Adam ) ▁are ▁also ▁still ▁alive . ▁ ▁Between ▁ 1 9 6 5 ▁and ▁ 1 9 7 0 ▁Fox ▁port rayed ▁the ▁b umb ling ▁" Col onel " ▁C ritt end on ▁( act ually ▁an ▁R AF ▁Group ▁Captain , ▁though ▁always ▁referred ▁to ▁as ▁a ▁Colonel ) ▁on ▁eight ▁episodes ▁of ▁Hog an ' s ▁Hero es . ▁He ▁appeared ▁in ▁two ▁episodes ▁in ▁the ▁detect ive ▁mystery ▁series ▁Col um bo , ▁" D agger ▁of ▁the ▁Mind " ▁and ▁" Tr ouble d ▁W aters ". ▁Fox ▁also ▁appeared ▁as ▁English ▁v alet ▁Mal col m ▁Mer i we ather ▁in ▁three ▁episodes ▁of ▁The ▁Andy ▁Griff ith ▁Show , ▁and ▁in ▁Knight ▁R ider ▁as ▁Commander ▁Smith s ▁in ▁season ▁ 2 , ▁episode ▁ 8 . ▁ ▁Fox ▁appeared ▁as ▁a ▁British ▁Major ▁in ▁" The ▁Ph antom