Ariel Castro is the father of the six year old girl that was found in his home on Seymour Avenue on Cleveland's west side.
Ohio Attorney General, Mike DeWine, confirmed this today through DNA testing.
Castro's DNA did not match any other Ohio cases, but the FBI is awaiting results of any national cases.
Also, Friday the FBI says it has concluded its investigation for now at Castro's home on Seymour for now. No human remains were recovered.
Castro was arraigned Thursday for rape and kidnapping. His bond is set for $8 million.
Thursday WKYC's Investigative Reporter, Tom Meyer, learned more about what Ariel Castro told police during an interrogation.
He told police he was addicted to sex and couldn't control his impulses.
Castro called himself "cold blooded." Read more of about the police questioning here.
Cleveland Police are reminding everyone that the victims in this case have asked for privacy.
Thursday police even offered to accept gifts and cards on behalf of the families.
Police said "The outpouring of community support surrounding the Amanda Berry, Michelle Knight and Gina DeJesus homecoming is greatly appreciated."
"In order to give the girls their privacy and time to heal, the Cleveland Division of Police is asking that anyone wishing to provide gifts or cards to the girls refrain from doing so at their homes."
"Instead, cards and gifts for Amanda Berry, excluding cash, can be dropped off at the First District located at 3895 West 130th Street in Cleveland." (READ MORE)
Visit our special section of WKYC.com for the latest details about this case, and to read more about what led up to Monday's discovery of Amanda Berry, Gina DeJesus, and Michelle Knight.
Photos: See Amanda Berry and Gina DeJesus pictures
Photos: Gina DeJesus, Amanda Berry come home
Photos: Ariel Castro in court
Photos: Decade in isolation
Complete coverage: Amanda Berry, Gina DeJesus, Michelle Knight found
911 Call: Help me I'm Amanda Berry
Dispatch tapes: "We found them!"
Rude dispatcher?: Police investigate dispatcher's handling of Amanda Berry's 911 call
How to help: Charitable fund set up for missing girls
Investigator: What Castro told police
Investigator: Amanda Berry's baby born in plastic pool
Investigator: Ariel Castro's past
Investigator: Women raped resulting in pregnancies
Details: Women only outside twice in past 10 years
Police audio: Police audio reveals how officers found women
Found alive: Amanda Berry and Gina DeJesus found alive
DeJesus homecoming: Gina gives a thumbs up
Amanda Berry homecoming: Family thanks community
Charges: Charges announced against Ariel Castro
Court appearance: Ariel Castro arraigned, bond set by judge
Castro family: Ariel Castro's family mortified to be related
Charles Ramsey: Neighbor tells how he helped rescue Amanda Berry
Charles Ramsey: Listen to 911 call that led to Amanda Berry rescue
Ramsey t-shirt: T-shirt for sale honoring Charles Ramsey as a hero
Michelle's mom: Michelle Knight back in hospital
Inside the house: Details emerge about house where victims held
Padlocks in house: Suspects' son says Seymour house had padlocks throughout
No human remains: No human remains found at home where women escaped
Jaycee Dugard: Cleveland women need opportunity to heal
Castro Brothers Id'd: Three brothers identified in missing women case
Timeline: Gina DeJesus
Timeline: Amanda Berry
Watch: Last 10 years looking for Amanda Berry and Gina DeJesus
Twitter trends: Amanda Berry and Gina DeJesus on Twitter
Family celebrates: Amanda Berry's family celebrates
Police: Amanda is the real hero here
Family shocker: DeJesus family reacts to Gina's return
Arrest: Ariel Castro and two brothers arrested in Amanda Berry case
Inside the house: Safety director talks about home where Berry, DeJesus were held
Out of the HOSPITAL: Three missing women released from hospital
Mayor reacts: Mayor Jackson talks about the release of the three missing women