American actor and musician
According to Wikipedia,
Keith Thibodeaux , also known as Richard Keith, is an American actor and musician, best known for playing Little Ricky on the television sitcoms I Love Lucy and The Lucy–Desi Comedy Hour. He was billed as Richard Keith because his Cajun French last name, "Thibodeaux", was considered too difficult to pronounce by producer Desi Arnaz. He is the last living regular appearing cast member from I Love Lucy.