A neighbor broke in, saw the man holding the children in the bathtub and shot him twice with a revolver.
According to Lisa Bratcher, a spokeswoman for Ada police, Foster showed up at the residence his wife, Michelle Forrells, where she was staying with their twins.
Freeman killed Foster with two shots.
The babies were "doing great" Sunday after having been released from the hospital, police in Ada told NBC News. According to KOFR, Ada police said the incident would go before the district attorney, who will decide if the homicide was justified.
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It is not clear whether Freeman will face charges for the shooting.
The three-month-old twins were treated at a hospital Friday and released on Saturday.
The next thing she remembers, said Sorrells, was the neighbor looking down at her, and asking if she and the babies were okay?
It is unclear at this time if Ms Forrells was physically hurt, but she was the person to call emergency services after Mr Foster was shot.
Neighbors told KFOR-TV that they are in shock.
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The street where the incident took place is seen. "They might not have made it", another told KFOR.
The neighbor, Cash Freeman, responded to the scene after a 12-year-old girl living next door came running and crying to his home around 12:30 p.m. Friday, pleading for help.
Freeman told KFOR News that he did what he felt like he needed to do to save the babies, but was concerned he would be in trouble.
In 2011, Foster was charged with domestic abuse by strangulation and arson, according to KFOR. They found a pile of clothes burning on a mattress and a bathtub filled with water and various electronics, NewsOK reported.
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