Fairfield police officers spent Monday on the campus of Green Valley Middle School interviewing everyone who came in contact with the 13-year-old student who was killed early Friday morning.
The girl's unclothed body was found at Fairfield's Allan Witt Park before sunrise by a man walking by.
The victim was in foster care and did not come home from school Thursday. She was reported missing Thursday night and her body was discovered the next morning.
"There's nothing worse than a homicide and there's nothing worse than a death of a young girl," said Fairfield police officer Cleo Mayoral. "We have a lot of resources on this in an effort to identify who did this."
A relative of the girl came out to the park Monday to see for herself where the girl was found. She placed purple and red tulips, the girl's favorite colors, at the make-shift memorial.
"She was a very sweet, loving girl," said Sandy who did not want to release her last name.
She said the family is heartbroken and wants answers.
"You hate to think about it and hate that it happened and yet you have the need to know," she said.
Police are releasing few details but did say they are working some leads.
"We don't have information that this is a random, just off the street abduction type situation," said Mayoral.
The Fairfield Unified School district has not issued warnings to parents but is providing counseling to children who need it.