Lyne was living with her father in Federal Way, Washington in 1997. She had a disagreement with him on March 21, 1997 over school: she was attending Auburn High School and he wanted her to transfer to Federal Way High School, and she did not want to. Lyne left their residence at approximately 9:00 p.m. Her father realized she was missing the next morning, and reported her disappearance to the police the day after that.

Lyne's father committed suicide four days after his daughter's disappearance, on March 25. Lyne has never been seen again. Authorities theorize that she may have returned home sometime after March 21 and discovered her father deceased, then fled due to the tragic scene. Lyne has never been heard from again. She lived with her father at the time of her disappearance; her mother lived elsewhere in town. Lyne and her father were apparently very close and there is no indication that she was abused by either parent. There is also no evidence that she was involved with gangs.

Lyne, who was born in El Salvador, worked as a professional model prior to her 1997 disappearance. She had changed schools often and had many problems with her parents. There have been unconfirmed sightings of her in the Puyallup, Seattle and Midway areas of Washington since her disappearance. Her case remains unsolved.