The county coroner's office has ruled Jones' death a homicide but hasn't listed the cause of death yet.
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Investigators detained "two persons of interest" in this case, and they are actively continuing their investigation, Deputy Tracey Koerner of the Sheriff's Information Bureau said in a written statement.
Since the discovery of the girl whose upper body stuck partially out of the bag and apparently was tossed from the roadway landing near the trail, authorities have attempted to identify her. Sheriff's officials are yet to confirm the identity or any other information due to the investigation.
Hoglund said authorities believed the girl had been left late on the evening of March 3 in light brush by the trail but did not know if she had been dead or alive.
Last Tuesday, county workers maintaining a horse trail in the scrubby hills east of Los Angeles noticed a black bag at the bottom of an embankment with something pink sticking out of the top.
"Sad moment for the department, for the community, and we're going to do our best to figure out what led to the suspicious death", Los Angeles County Sheriff Alex Villaneuva told CBS Los Angeles previously.
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Family members gather on March 10, 2019, at the scene where a little girl was found dead inside of a duffel bag in Hacienda Heights on March 5, 2019.
- Katherine Picazo (@KatPicazoo) March 11, 2019NEW: Realitves say the girl found dead in Hacienda Heights earlier this month is 9-year-old Trinity Love Jones.
"I just want answers", Antonio Jones said, KTLA reported. I just want justice, ' he said.
"This has really hit home", she said.
No further details regarding the circumstances of the girls death, or the ongoing investigation, were available Sunday.
Meanwhile a large memorial near where Trinity's body was found continued to grow Monday, with people stopping by to add Disney balloons, teddy bears, flowers and photos of the bright-eyed girl.