▁her ▁character , ▁Mar issa , ▁died ▁in ▁the ▁third ▁season ▁finale . ▁Aut umn ▁Re es er ▁as ▁recent ▁high ▁school ▁gradu ate ▁Taylor ▁Town send , ▁and ▁W illa ▁Holland ▁as ▁Mar issa ' s ▁younger ▁sister ▁K ait lin ▁both ▁joined ▁the ▁main ▁cast , ▁having ▁previously ▁held ▁rec urr ing ▁roles . ▁Other ▁cast ▁members ▁returning ▁in ▁rec urr ing ▁roles ▁include ▁Cam ▁G ig and et ▁as ▁Vol ch ok , ▁Er in ▁F oster ▁as ▁He ather , ▁Michael ▁N ouri ▁as ▁Summer ' s ▁father ▁Dr . ▁Neil ▁Roberts , ▁Pa ula ▁Tr ic key ▁as ▁Taylor ' s ▁mother ▁Ver onica , ▁and ▁Ash ley ▁Hart man ▁who ▁star red ▁as ▁Hol ly ▁Fischer ▁in ▁the ▁first ▁season . ▁Additionally ▁former ▁main ▁cast ▁member ▁T ate ▁Don ovan ▁returned ▁as ▁Jimmy ▁Cooper ▁in ▁a ▁non - can on ical ▁appearance . ▁ ▁Act ors ▁who ▁left ▁the ▁cast ▁include ▁Ryan ▁Don ow ho ▁( John ny ), ▁Jer i ▁Ryan ▁( Char lot te ), ▁Sh a un ▁Duke ▁( Hen ry ▁Griff in ), ▁Kay la ▁E well ▁( Case y ), ▁and ▁Nik ki ▁Re ed ▁( S ad ie ). ▁New ▁members ▁who ▁joined ▁the ▁cast ▁include ▁Kevin ▁Sor bo ▁as ▁Ryan ' s ▁father ▁Frank ; ▁Gary ▁Gr ub bs ▁as ▁an ▁oil ▁merchant ▁who ▁calls ▁himself ▁The ▁Bull it ; ▁Br andon ▁Qu inn ▁as ▁Bull it ' s ▁son ▁Sp encer ; ▁Chris ▁Pr att ▁as ▁an ▁environmental ▁activ