Their parents took him to several psychiatrists, she said, and one of them recommended he attend a boarding school specializing in helping children with depression.
In January 2004 Daniel started at the Cedu School in San Bernardino, California, his sister said.
On Feb. 8, 2004, 16-year-old Daniel disappeared, said private investigator Keith Raymond.
Now, Raymond said Daniel may be living in San Diego.
The school reported Daniel Yuen as a runaway to the San Bernardino County Sheriff’s Office, said sheriff’s office spokeswoman Cindy Bachman. It was reported that Daniel left voluntarily and ran away from the school with none of his belongings or money, said Bob Lowery with the National Center for Missing and Exploited Children
Selena Yuen, who was 12 at the time, called her brother’s disappearance “absolutely heartbreaking.”
“I looked up to him a lot,” said Selena Yuen, now 28. “He was kind, supportive, very loyal to his friends
Raymond, a police officer turned private investigator who worked at the now-shuttered behavioral school for eight months, scoured the grounds near the school that first day.
He criticized what he described as harsh and controversial punishments by the staff.
Students often ran away from the school, which has faced multiple
Bachman, from the sheriff’s office, told ABC News nothing in Daniel Yuen’s missing persons report indicated anyone at the school was believed to be engaging suspicious behavior