▁first ▁professional ▁co aching ▁ten ure ▁as ▁the ▁off ensive ▁co - ordin ator ▁for ▁the ▁B . C . ▁L ions ▁under ▁head ▁coach ▁Don ▁Matt he ws . ▁ ▁In ▁ 1 9 8 9 , ▁R ita ▁left ▁the ▁C FL ▁to ▁join ▁the ▁co aching ▁staff ▁of ▁the ▁U BC ▁Th under bird s ▁of ▁C IA U ▁football . ▁ ▁In ▁ 1 9 9 0 , ▁R ita ▁rejo ined ▁Matt he ws ▁in ▁Toronto ▁as ▁off ensive ▁coordin ator ▁for ▁the ▁Toronto ▁Arg onaut s . ▁In ▁ 1 9 9 1 , ▁after ▁Matt he ws ' ▁departure , ▁R ita ▁became ▁a ▁first ▁time ▁C FL ▁head ▁coach ▁for ▁the ▁Arg onaut s ▁with ▁whom ▁he ▁won ▁his ▁first ▁and ▁only ▁Grey ▁Cup ▁championship ▁as ▁a ▁head ▁coach ▁in ▁that ▁same ▁year . ▁In ▁September ▁ 1 9 9 2 , ▁after ▁a ▁ 3 - 8 ▁start ▁to ▁the ▁season , ▁R ita ▁was ▁fired ▁as ▁Arg onaut s ▁head ▁coach . ▁ ▁In ▁ 1 9 9 3 , ▁R ita ▁joined ▁the ▁Ed mont on ▁E skim os ▁as ▁their ▁off ensive ▁coordin ator . ▁The ▁team ▁went ▁on ▁to ▁win ▁the ▁ 8 1 st ▁Grey ▁Cup ▁that ▁year . ▁ ▁In ▁ 1 9 9 4 , ▁R ita ▁became ▁the ▁head ▁coach ▁of ▁the ▁Ott awa ▁R ough ▁R iders . ▁The ▁team ▁went ▁on ▁to ▁finish ▁their ▁season ▁with ▁a ▁ 4 - 1 4 . ▁