ISSAQUAH, Wash. — The husband of a suburban Seattle teacher who began having a sexual relationship with him as a sixth-grader has filed for separation, according to documents filed here in King County Superior Court.

Vili Fualaau, now 33, married Mary Kay Letourneau in 2005 after she was released from a more than seven-year prison sentence for having sex with a minor. The couple, whose most recent address is listed as Des Moines about 15 miles south of Seattle, has two daughters ages 18 and 20.

“She could try to contest it, but that’s legally tough to do,” Letourneau’s lawyer, David Gehrke, told People magazine. “Perhaps if they want to figure out about the children and child support, but their kids are getting pretty old now.”

Fualaau’s lawyer declined to comment on the case. The paperwork was filed May 8 but first reported Tuesday.

In 1995, Letourneau, now 55, was a 34-year-old married mother of four when she began having sex with Fualaau, then 12. She had been his second- and sixth-grade teacher.

► April 2015: Mary Kay Letourneau, former student discuss relationship
► January 2014: Ex-teacher Mary Kay Letourneau briefly jailed

She was first convicted of second-degree child rape the next year after giving birth to Fualaau’s first child, received a six-month jail sentence and agreed not to have further contact with Fualaau.

Letourneau was released after three months but got caught having sex with Fualaau soon afterward, became pregnant again and was sentenced in 1997 to more than seven years in state prison for her parole violation.