In a radio dispatch call, a frantic Kametra Sampson can be heard screaming and telling a Dallas County constable that her children have been kidnapped. The female constable is also heard telling dispatch what has happened.

"She says the baby daddy took the kids and that she jumped out of the car."

The constable did not chase the suspect, Naim Muhammad, instead calling Dallas police for help. Before Dallas officers arrived, investigators say Muhammad drowned 5-year old Naim and his 3-year old brother, Elijah in a creek.

The actions of the deputy constable who is assigned to Precinct 1 are under scrutiny to determine if she broke with policy or procedure by not offering more help. According to reports, she told the desperate mother that she had no lights or siren and was unable to purse the father. Law enforcement officials say the constable had options.

"Nothing would have prevented the officer from at least following the suspect, whether or not she had lights and siren," said Peter Schulte, a former spokesperson for the McKinney Police Department.

Schulte, who is an attorney, finds it hard to believe a marked cruiser had no lights or siren. He says the officer had a legal, if not moral and ethical obligation to act.

"The code of criminal procedure is clear, that the officer has a duty to act. But, in this case there will be questions about whether just calling Dallas police was action enough."

While the deputy constable faces questions, so does the child's mother, who state officials say was warned to keep her children away from their violent father.

CPS officials say they told Sampson earlier this year not to leave her children alone with Muhammad, who is convicted felon. Family members say he has a violent streak. Since the drowning, CPS has removed Sampson's infant child from the home.

Muhammad was accused in February of slugging Sampson in the face, but authorities say there was no protective order in place when the children were killed.

"I think this sounds like a very dangerous man and it seems that family members knew he was dangerous," Kristen Howell, with Genesis Women's Shelter, said.

Howell says victims of domestic violence should always seek expert help to get out of a violent relationship. She says Muhammad showed all the signs of a ticking time bomb.

"When we see a man as violent as this, we know that the children are at risk."