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No criminal charges have been filed against a 15-year-old boy who police suspect of killing 12-year-old Kailey Vijil in a West Valley City pasture last Friday.

But Salt Lake City District Attorney Sim Gill said prosecutors will screen the case on Tuesday and decide what charges, if any, will be filed against the boy.

"We are still in the process of the investigation," Gill said Monday.

In the meantime, the teenager ­— who police say lived a block away from Vijil — is being held at the Salt Lake County juvenile detention center on suspicion of criminal homicide.

West Valley City police officials said Vijil was last seen at her home around midnight on Friday, when the 15-year-old boy came to her door and "enticed" her to come outside by asking her for some sort of help.

"She was a good-natured child who was fooled ... and paid the ultimate price for it," police chief Lee Russo said last Friday.

Russo would not provide details as to what sort of help the suspect claimed to need, but said investigators are aware of no other contact, digital or in-person, between the boy and Vijil.

Vijil was first reported missing at about 1:30 a.m. Friday, after her mother was out looking for her daughter and happened upon police at a 7-Eleven near 3500 South and 5200 West, according to police.

Officers pinged Vijil's cell phone, which led them to an overgrown horse pasture near 3600 South and 5200 West, about a half-mile from where the girl lived. At around 3 a.m., investigators first found a depression in the weeds, and "evidence of a struggle," Russo said. They found Vijil's body about 30 feet away. Investigators have said they found evidence of trauma but no sign that she was stabbed or shot, Russo said.

Not long before Vijil disappeared, the suspect tried a similar ruse with an 11-year-old girl who lives in the same neighborhood, Russo said, but that girl's parents intervened.

The 11-year-old girl's report helped police identify the suspect, whom they found in a different neighborhood at about 1:30 p.m. on Friday.

If the 15-year-old is charged with murder, the case will be filed in juvenile court, though prosecutors can seek to have him certified as an adult.

A judge will make that decision after hearing evidence and weighing the severity of the alleged crimes, the community's safety, as well as the youth's psychological records, family history and rehabilitation needs.

jmiller@sltrib.com

Twitter: @jm_miller