Clay County Sheriff Rick Beseler said Wednesday the case for the search for Somer Thompson's killer is not cold and the investigation is still very active.

Thursday marks one month since the 7-year-old girl disappeared while walking home from school in Orange Park.

Since her body was found, investigators from several agencies have been processing clues trying to identify a suspect.

More than 4,200 tips have poured in to investigators, who have have been looking into each one of them.

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Investigators with the FBI, the Florida Department of Law Enforcement, the U.S. Marshal Service, and the Navy Criminal Investigation Service are still assigned to the case alongside the Clay County Sheriff's Office, providing manpower and expertise.

The sheriff's office said it's also waiting for evidence in the case to be processed at the crime lab.

Over the last month, they've searched for evidence in a number of places, like the Dumpster and the home on Gano Avenue near where Somer was last seen, as well as the Georgia landfill where Somer's body was found.

The sheriff's office said the evidence will give investigators more direction and help them focus on a suspect.

They said the process is time-consuming but very important to the case and can't be rushed.

In Wednesday's update from the sheriff's office, Beseler said waiting on lab results is part of the process in a case like this and added the results could take weeks.

He went on to say, "This case is not a cold case ... not by far. This case remains hot with emerging leads and many pieces of evidence. Our team is very active and will remain so for weeks to come."

The sheriff's office sent a photo that gives an idea of their determination to find Somer's killer.

Investigators printed up posters with Somer's picture and the caption, "Remember ... this is who we are working for."

The posters are displayed in hallways and offices as a constant reminder.

In the background of the photo, you can see one detective working the case with phones to both ears.

Members of the investigative team said they are exhausted but very determined.