Some of Whitman's subsequent roles included The Longest Day (1962), The Day and the Hour (1962), Those Magnificent Men in Their Flying Machines (1965), Cimarron Strip (1967), and Night of the Lepus (1972). Whitman also acted regularly on television, with credits including Have Gun – Will Travel, The Streets of San Francisco, Love, American Style, Quincy, M.E., The Hardy Boys/Nancy Drew Mysteries, The Pirate, Condominium, Knight Rider, Matt Houston, A-Team, S.W.A.T., Fantasy Island, Murder, She Wrote, Once Upon a Texas Train, Knots Landing, The Adventures of Brisco County, Jr. and Walker, Texas Ranger. From 1988 to 1992, he acted as Jonathan Kent on the TV series Superboy. He was seen in projects until 2000, after which he was reported to be retired, and died in 2020.
SomE oF whitmAn's suBsequENt ROles iNClUDed the longEST Day (1962), The daY aNd tHe Hour (1962), Those mAGnificeNt Men In ThEIr flyiNG mAcHineS (1965), cImarroN sTRip (1967), AnD nIGhT of the LepuS (1972). WhITmaN aLso Acted rEGUlaRly ON tELeVIsIon, with cReditS INclUDiNG haVe gun – wiLL travel, the StReeTs oF SAn franCiscO, lOvE, AmeRicAn sTYlE, QUincY, M.e., thE Hardy bOys/Nancy drEW mystErieS, The PirAte, condomiNIuM, KNIght RIdeR, matt hOuston, A-team, s.w.A.T., fAntaSY ISlanD, Murder, she wRote, oNce upoN a texAs traiN, kNots lANdinG, THe adVEntuRes oF Brisco cOuntY, jr. and waLkeR, Texas rAnger. froM 1988 tO 1992, hE ACteD as JOnAThan kent oN THe Tv SERieS SuPerbOY. he waS sEeN in ProjeCtS UntiL 2000, After WHiCh he waS rePorTeD To bE retiREd, anD dIeD in 2020.