DALLAS (CBSDFW.COM/AP) — Prosecutors in Dallas are seeking the death penalty against a man charged with drowning two of his sons in a creek.

Testimony is scheduled to begin Monday afternoon in the trial of Naim Muhammad. He faces two counts of capital murder in the 2011 deaths of his sons — 5-year-old Naim and 3-year-old Elijah.

Muhammad allegedly used a brick to force the boys and their mother into his vehicle as she walked the children to school. The older boy was starting kindergarten.

The woman jumped out at an intersection and alerted a nearby constable, who called police but didn’t pursue the fleeing vehicle. Constables are mainly process servers in civil cases.

Muhammad’s mother later called 911 to say her son had drowned the boys and she had the unresponsive bodies. Paramedics responded to the scene, performed CPR and took the kids to Children’s Medical Center. Both children were pronounced dead at the hospital, and police later confirmed the boys were drowned.

Muhammad also attempted to take his third child, a 1-year-old, from Sampson’s grandmother’s house. The grandmother was able to stop Muhammad from taking the child.

Relatives say that Muhammad had threatened Sampson and their children on a number of occasions.

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