Actor Bill Cosby has expressed his grief over the loss of Malcolm-Jamal Warner, who played his son Theo Huxtable on “The Cosby Show.” Cosby praised Warner’s professionalism and dedication to his craft, noting that he always knew his lines and character. Warner, 54, tragically died in an accidental drowning while on vacation in Costa Rica. Cosby shared that Warner and his real-life son, Ennis, who was murdered in 1997, were friends during their youth. Despite his legal troubles, Cosby maintained a paternal bond with Warner and other “Cosby Show” alumni.