Hollywood actor Cliff Robertson has died at the age of 88. He played a young John F Kennedy in the biographical 1963 film PT-109 and won an Oscar in 1968 for his performance in Charly as a mentally disabled man. Never a top leading man, Robertson remained a popular actor from the mid-1950s onwards. His later roles included the kindly Uncle Ben in the Spider-Man movies. His secretary said he had died in New York state of natural causes. \"My father was a loving father, devoted friend, dedicated professional and honourable man,\" his daughter Stephanie Saunders said in a statement quoted by Associated Press news agency. \"He stood by his family, friends, and colleagues through good times and bad. We will all miss him terribly.\"