Vili Fualaau, former student and current husband of Mary Kay Letourneau, has filed for separation, according to court documents.
In 1996, Letourneau was caught having sexual relations with Fualaau, who was her sixth grade student at the time.
The two got married in 2005 just after Letourneau was released from a seven-year prison sentence for having sex with a minor.
The couple has two children together.
Fualaau's attorney declined to comment on the case.