Arden Pepion would have turned 4 on the day of the search. The event is slated to last all day, running from 9 a.m. to 6 p.m. on Sept. 5.
This week, Lydia Lerma, a MMIP advocate, was able to alert Operation Lady Justice, the Presidential Task Force on Missing and Murdered American Indians and Alaska Natives to Arden's case.
The Blackfeet tribal prosecutor’s office said no human remains have been located in connection with the case.
HaHaax Vielle and Kimberly Higgins appeared in Blackfeet Tribal Court on Wednesday afternoon. On June 3, arrest warrants and charges were filed against them. Their trial is scheduled for Sept. 15
The walk will start in the morning at the Blackfeet Community College in Browning. It will be followed by a search for Arden Pepion on Saturday afternoon and Leo Wagner on Sunday morning.
The names of the people arrested have not been released by law enforcement.
Over the past month, conflicting accounts of what happened to Arden Pepion and frustration with how law enforcement has handled her disappearance have become prominent pillars of the case.
Pepion was last seen on April 22 in the surrounding areas of Joe Show East off U.S. Highway 89 South on the Blackfeet Reservation. She had been missing for between five and six hours before officials were contacted.
Arden Pepion has been missing since Thursday evening at around 7 p.m.