Question: who played little ricky on i love lucy show?
Answer: Keith Thibodeaux

Keith Thibodeaux ( born December 1 , 1950 ) is a former American child actor of television and film and musician , best known for playing Little Ricky on the television sitcom 's I Love Lucy and The Lucy - Desi Comedy Hour , his last name '' Thibodeaux '' which was Cajun French was changed by co-star Desi Arnaz , to '' Keith '' because his surname was more difficult to pronounce . He is the last living regular appearing cast member from I Love Lucy .