Which Old Characters Will Return In NCIS?Credit:- GoogleNCIS is set to welcome back a beloved character in Monday's episode.Credit:- GoogleMargo Harshman will appear in the upcoming instalment. Credit:- GoogleThe show's official Twitter account teased the episode.Credit:- GoogleIn the video, Sean Murray as Timothy walking alongside his wife, Margo, in a wheelchair.Credit:- GoogleFans were quick to react to the news.Credit:- GoogleOne person writing: "Finally! Nice to see Timothy's wife again!"Credit:- GoogleWhile another added: "Yayyyyy!!! I've missed Delilah!"Credit:- GoogleThe episode, titled High Education, will see the team investigate the death case.Credit:- GoogleThe victim is also revealed to have had connections to Timothy's wife.Credit:- GoogleThe episode is set to air on CBS on Monday 2 January.