Investigators believe one man is the common link in two missing-girl cases.
11-month-old Estella Lovemore went missing on Sunday, and 2-year-old Caroline Oddo has been missing since November.
Luis Palacio is officially considered a suspect in one of the cases and a person of interest in the other.
Palacio is the biological father of Oddo. He's also the boyfriend of Lovemore's mother, Danielle Lovemore.
The Tucson Police Department issued a felony arrest warrant in Palacio's name accusing him of custodial interference in Oddo's case.
Meanwhile, Marana police consider Palacio a person of interest in the Lovemore disappearance.
Estella went missing Sunday when her mother reportedly took her from a birthday party at Gymnastics World in Marana.
Richter Lewis, Estella's father, said Child Protective Services told him that Estella had been abducted.
"They said my daughter had been abducted by Danielle, and that's pretty much all I heard about it from them," Lewis said.
"I didn't even have a Facebook account until last night, and I'm doing this just to find Ella. My main concern is trying to find my daughter and get her back home."
Oddo's mother, Anna Oddo, described Palacio as a violent man who hurt her and embarrassed her on several occasions.
She said she never witnessed Palacio hurting their daughter, but feels he is capable of doing so based on what he's done to her.
Police say Estella Lovemore has already suffered a broken elbow and multiple bumps and bruises. Police did not determine how she was injured, but CPS removed her from her home.
Police say her mother's reported abduction of her Sunday only placed her in harm's way.
Marana Police Sgt. Jose Alvarez says, "Right now we don't know where she's at and we're concerned for her safety. So until we find out further and know that she's safe, we're going to call her a missing and endangered person to give her heightened awareness."
If you have any information about the two missing girls, Palacio or Danielle Lovemore, call 911 or 88-CRIME.
A reward up to $1,000 will go to the person whose tip leads to an arrest in each unsolved case.
It is not entirely clear that Palacio and Lovemore are together, but police saw the couple together in November when Estella suffered her broken elbow, and Marana police say Lovemore is five months pregnant with Palacio's child.
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