Credit: Steven Lawton/FilmMagic; Anna Webber/

Heidi Montag is mourning the loss of her plastic surgeon, Dr. Frank Ryan, who was killed in a single-car accident Monday in Los Angeles.

Ryan, 50, of Beverly Hills, famously performed 10 plastic surgery procedures on Montag, 23, in one day last year.

"I am devastated to hear the news of Dr. Frank Ryan's death," she wrote on Twitter. "He was the most amazing person I have ever known. He was an angel and changed my life and the lives of everyone he met. He was the most brilliant talented surgeon who will ever exist. Dr. Frank Ryan changed the world."

"My thoughts and prayers go out to his mother, family, friends, and anyone who was ever blessed enough to meet him," she concluded. "He is in a better place."

His colleague Dr. Lawrence Koplin tells in a statment, "Dr. Frank Ryan helped to popularize plastic surgery amongst celebrities. He made it acceptable for people to show their flaws and vulnerabilities and feel that it is OK to make improvements. His efforts helped to spark the popularity of plastic surgery in the television and broadcast world and help to enlighten the general population about such procedures that they were most likely unfamiliar with or had negative perceptions of."