The family of Elizabeth Elena Laguna-Salgado, whose body was found under suspicious circumstances three years after she went missing, expressed frustration Wednesday with the investigation into her death, saying there are suspects that law enforcement needs to look into.

Laguna-Salgado’s body was found in Hobble Creek Canyon in May. The 26-year-old, originally from Chiapas, Mexico, had been missing since April 16, 2015, when she was last seen walking home from her English language class.

According to the Utah County Sheriff’s Office, Laguna-Salgado’s death is being investigated as a homicide.

Laguna-Salgado’s family flew into Salt Lake City Tuesday night. They said they hoped the case would be solved and the person responsible for her death would be found.

“We feel like there are suspects. As family members, we feel like there are suspects,” Rosemberg Salgado, Laguna-Salgado’s uncle, said.

Laguna-Salgado’s family said she told them someone had been asking her “a lot of questions” before she disappeared.

“Before Elizabeth disappeared, before she went missing, this person was asking her, ‘I want you to tell me exactly everything about your life. Every single detail about your life,’” Rosemberg told FOX 13.

Laguna-Salgado’s family expressed frustration with law enforcement officials over how the investigation had been handled so far. They said they told police multiple times that a person of interest had been asking her invasive questions but that police have dismissed their claims.

“I am so frustrated with this case because we have been telling them so many times, over and over again, please investigate this person, but they said there is nothing to investigate,” Rosemberg said.

Authorities say they are interviewing “persons of interests.”

The Associated Press contributed to this report.