Kayla Dunigan, 18, was one of three young people with 15-year-old Sarah Botill the night Botill died.
Dunigan was the only person charged. She pleaded guilty to a misdemeanor for providing alcohol to a minor.
This tragedy got a lot of attention in Gilroy -- the victim, Botill, was the daughter of a former Gilroy firefighter.
The slumber party was held at the home of a former City Council member.