Filing charges Thursday, prosecutors claim Eli T. Godbolt - a Todd Beamer High School teacher who was in jail - made the admission following his arrest on allegations that he had consensual sex with the 16-year-old student.
"I'm guilty," Godbolt, 33, told his wife during a recorded phone call from jail, according to the prosecution.
Godbolt, an Auburn resident, has been charged with two counts of sexual misconduct. Godbolt was not charged with child rape due to the girl's age, but is instead accused of abusing the position of power he had over the child.
According to charging documents, Federal Way police received a report in late September that Godbolt was sexually involved with a student.
Investigators learned Godbolt professed his love for the girl in May 2011 and later convinced her to meet him outside of school. Writing the court, a Federal Way detective asserted they had sex on several occasions.
The detective asserted she has collected DNA evidence that likely links Godbolt to the girl.
Godbolt is expected to appear for arraignment on Nov. 14 at the Norm Maleng Regional Justice Center in Kent. He does not appear to be jailed.