ab ler . ▁John ▁Ritter ▁guest ▁star red ▁as ▁Dr . ▁Mann ing , ▁a ▁psych iat rist ▁who ▁becomes ▁the ▁prime ▁suspect ▁in ▁his ▁wife ' s ▁murder , ▁in ▁the ▁episode ▁" Mon og amy ". ▁Ritter ▁was ▁pra ised ▁for ▁his ▁performance ▁in ▁the ▁episode , ▁which ▁a ired ▁shortly ▁before ▁his ▁death ; ▁Michael ▁Buck ley ▁of ▁TV ▁Guide ▁wrote ▁that ▁" The ▁grad ual ▁change ▁in ▁his ▁de mean or ▁makes ▁for ▁a ▁memor able ▁piece ▁of ▁acting ." ▁ ▁Mar tha ▁Pl im pton ▁was ▁nominated ▁for ▁the ▁Prim etime ▁Em my ▁Award ▁for ▁Out standing ▁Gu est ▁Act ress ▁in ▁a ▁D rama ▁Series ▁for ▁her ▁role ▁in ▁" Den ial ". ▁She ▁played ▁Cla ire ▁R in ato , ▁a ▁drug ▁add ict ▁who ▁is ▁tra um at ized ▁by ▁having ▁learned ▁terrible ▁things ▁about ▁her ▁mother , ▁played ▁by ▁Mary ▁Ste en bur gen . ▁Det ect ive ▁T ut uola ▁tries ▁to ▁help ▁her ▁character ▁recover ▁from ▁the ▁add iction ▁using ▁his ▁background ▁as ▁a ▁n arc ot ics ▁detect ive . ▁In ▁" Gu ilt ", ▁Bret ▁Harrison ▁played ▁Sam ▁Cav an augh , ▁a ▁child ▁mol est ation ▁victim ▁who ▁is ▁rel uct ant ▁to ▁test ify ▁against ▁his ▁ab user . ▁This ▁appearance ▁later ▁helped ▁Harrison ▁secure ▁his ▁best ▁known ▁role ▁in ▁Re aper , ▁which ▁was ▁created ▁by ▁the ▁same ▁writers ▁as ▁" Gu ilt ". ▁ ▁In ▁the ▁second ▁last ▁episode , ▁" Comp et ence ", ▁a