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TUCSON- Where is Isabel Celis? The 6-year-old disappeared in April 2012 from her midtown home.

Since then, Tucson Police have followed up on more than 2, 000 leads and spent about $1 million on the investigation.

New detectives, along with a new sergeant, were assigned to the case a year ago. They've re-canvassed the neighborhood, but still nothing on the little girl's whereabouts.

Police say as new leads come in, they follow up on them.

The private investigator the family contacted said, “Whoever did this knows the family 100 percent guaranteed, and my suspect has a key to the house.”

Retired federal agent Jerry "Kelly" Snyder is the founder of "Find Me, " an organization he started in 2002 to look for missing children. His group has been searching for Isabel Celis since the 6-year-old was kidnapped in April 2012. He has two suspects who we can't name because they've not been charged with a crime.

“I provided the Tucson Police Department with two individuals names who I truly believe were involved in her disappearance, " said Snyder. "Either physically they took her, or they had something to do with her disappearance.”

In January we interviewed a detective who has been on the case since the beginning. He said they don't deal directly with private investigators however, Greg Wright said, “We will take any information that anybody has on this case and we will review it and we will follow up on whatever that information is.”

On the night Isabel disappeared from her house, it's reported her bedroom window was open and the screen set aside.

Snyder found out the two possible suspects even helped in the search for Isa.

“One of them retained an attorney immediately, which is somewhat of a red flag, ” Snyder said.

Other red flags?

“One of them moved out of Tucson almost immediately, ” Snyder said.

He added his vehicle “was sent out of town two, or three days before he left town. Huge red flag again.”

The other individual Snyder referred to still lives in Tucson. Snyder spoke to him on three separate occasions.