Homicide detectives joined the case of missing pregnant woman LaToyia Figueroa ( search) overnight, even though there is no evidence of foul play.

Police also questioned Figueroa's boyfriend again overnight.

Police say they found nothing in their search of Cobbs Creek Park ( search) in west Philadelphia. They spent yesterday looking for clues to the disappearance of the 24-year-old, who is five months pregnant. She was last seen on July 18th walking from her boyfriend's home after the two went to a doctor's appointment.

Her boyfriend is the father of the unborn child.

Her father, Melvin Figueroa, told FOX News he was worried about her disappearance.

"Something's foul, something's wrong because LaToyia is not the type of person to do this," Figueroa said.

LaToyia has a 7-year-old daughter. Friends and relatives say LaToyia would never abandon her daughter voluntarily.

"If it was a case like that, she'd call me, or my wife, or another family member or one of her friends to take care of her daughter," Figueroa said.

The Citizens Crime Commission of Delaware Valley offered a $10,000 reward for information about her whereabouts. Police have declined to speculate about what happened to her.

LaToyia's father also elaborated on his daughter's relationship with her boyfriend.

"Two months ago, she was coming out of her house at 57th and Spruce to go to work, and a young lady pushed her. The young lady turned her around and kicked her in the stomach," said the elder Figueroa.

"Since then she's been having problems with her boyfriend's ex-girlfriend," he added. "I think he's using the two ladies against each other, and it's not right."

Police said LaToyia's boyfriend was cooperating with investigators.

Stephanie Stephenson, LaToyia's cousin, who raised her after LaToyia's mother was murdered, told FOX News she knew the couple was having problems. As far as Stephenson knew, there was no violence involved.

"She did make me aware of the situation [with her boyfriend], it is a possibility," Stephenson said. "I am not ruling out a lot of things. I have concerns and anything is possible."

Stephenson added that she did not trust the boyfriend because "there's just something about him."

When asked about reports that her boyfriend was the last person to have seen her, her father said, "Yes, the young man says he dropped her off at 52nd street. Then he came back and said something else. I don't know — he's got so many different stories."

Her cell phone has gone quiet since that day and her bank has not recorded any transactions on her account, officials said.

Christine Lewes, a childhood friend and high school classmate, said LaToyia was very responsible and had never missed shifts at her restaurant job until her disappearance.

Stephenson called her "a devoted and responsible parent" with a beautiful spirit who loved her daughter very much.

"She was loyal and trusting to a fault," Stephenson told FOX News.

An uncle who is a police officer, Jose Figueroa, said Wednesday, "It's hard to see a young lady her age go missing. It's hard to imagine a young lady of 24 just disappear out of thin air."

She is 5-foot-2 and 130 pounds, and African-American.

Anyone with information about her disappearance can call 215-686-3183.

The Associated Press contributed to this report.