The 47-year-old 'Pretty Woman' star worked with the filmmaker on his last two directorial projects, the Oscar-nominated 'Closer' in 2004 and 'Charlie Wilson's War' in 2007, and she said the sudden passing of her "remarkable and amazing" has left her devastated, reported People magazine.
"There are so few heroes in our world. So few impeccable craftsmen, so few people who personify unconditional love and friendship. Mike Nichols was like no other. In every way he was remarkable and amazing," Roberts said.
Closing her tribute, Roberts said, "He was my most cherished friend.