DALLAS (CBSDFW.COM) – The Dallas County Sheriff’s Department will investigate a Deputy Constable accused of failing to help stop a father who police say killed his two children. Naim Muhammad is accused of drowning them this past Monday.

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Sheriff investigators will try to determine whether the female Constable Deputy acted appropriately when she refused to pursue Muhammad.

Muhammad’s ex-girlfriend flagged down the deputy and told the officer that her two children were in Muhammad’s car and that he was going to kill them. The deputy told the mother that she could not pursue the car because her cruiser did not have flashing lights and sirens.

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Dallas police say Muhammad eventually drowned his two children in a creek.

Precinct One Constable Derick Evans told CBS 11, “We’re sending the case to them (Dallas County Sheriff’s Department) to make sure that all questions are answered and so no one thinks there is a cover up by the Constable’s Office.”

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The aunt of the two boys who died says the family will comment after the funeral. Funeral services are scheduled for Saturday.