BREMER COUNTY, Iowa — It’s been a year since investigators released new information about the July 2012 disappearance of 8-year-old Elizabeth Collins and 10-year-old Lyric Cook.

In February 2015, investigators say they believe whoever was involved was familiar with the Seven Bridges Wildlife area in Bremer County. The girls’ bodies were found in rural Bremer County in December 2012.

Authorities fielded hundreds of tips a year ago after the new information was released, but now that has slowed.

DCI investigator Mike Roehrkasse told KWWL-TV that authorities are still reviewing all tips. He still stresses the public to call with any information about the Seven Bridges area.

Elizabeth’s parents, Heather and Drew Collins, still communicate with investigators everything other week. They say even though time has passed, they hold onto hope the killer will be found.

“Justice will be served. I do believe that. It just takes time to go through all that stuff and all the information and all that,” Drew Collins told KWWL.

The Collins believe the girls were killed the same day they were abducted.

In April, one of the lead investigators into the abduction and murder was fired. Evansdale Police Chief Kent Smock was fired after only being with the department for three years.

Evansdale mayor Doug Faas said he could not release the reason for the firing, calling it a private personnel issue.

If you have any information please call the tip line at 855-300-TIPS or 855-300-8477.