HOUSTON -

Harris County detectives said a woman shot and killed her brother Friday.

Diondra Deville was arrested and charged with the murder.

Deputies said around 3:45 p.m., Deville was inside her home at 10514 Mist Lane with her two brothers and five young children. They said the older brother,  Dominic Small, started fighting with his family.

"A 28-year-old black male was having an argument with everybody in the household," said Sgt. Robert Spurgeon, "and a fight between him and his brother took place."

Investigators said Deville went into another room, grabbed a gun, and came back to break up the fight. She's accused of shooting Small in the chest.

"The sister retrieved a handgun and shot her brother," said Spurgeon.

Sherry Mankin lives across the street and said she heard a woman yelling for help.

"I looked out my window and there was a lady screaming on the driveway," said Mankin. "She was laying down, kind of rolling in the grass."

Family members of the brother and sister said the woman yelling for help was the victim's girlfriend.

Those family members also said the sister shot Small in self defense, because he was physically fighting and threatening her and the younger brother.