A father and son were killed and a woman and 4-year-old girl were injured during a stabbing in a Maryland Heights home Thursday night.

Malcom B. Mathis II, 33, and 22-month-old Malcom B. Mathis III were found dead inside a home in the 12400 block of Marine, located near Westport, around 8:15 p.m.

Police said Mathis II was also beaten with a hammer during the attack.

Police said a 4-year-old girl and her 57-year-old great aunt were taken to the hospital after sustaining multiple stab wounds during the incident. The girl was listed in ‘very critical’ condition and was undergoing surgery Friday morning. The woman was listed in critical but stable condition following the stabbing.

"We're a really, really, really quiet neighborhood. We haven't had any crime out here in a long time," said Lisa Taylor, who lives near where the stabbing occurred. "The fact that it's domestic and children are involved and I'm a mom, makes it even worse."

Two suspects were taken into custody overnight. Police have charged 20-year-old Traveon Sims and 21-year-old Onyai Turner with murder. Sims is charged with two counts of murder, two counts of assault and four counts of armed criminal action. Turner faces one murder charge and one charge of armed criminal action.

The stabbing is considered a domestic incident because Sims is the nephew of Mathis II.

According to police, the great aunt and two children were stabbed first. Sims was still in the home when Mathis II arrived. After the children’s mother arrived home, she found the stabbing victims and called 911.

The victims were reportedly found throughout the house. The man was found in the kitchen downstairs and the boy was found on the second floor in the doorway of a bedroom.

"It is a very unusual crime for Maryland Heights but this is the type of thing you can't really patrol against. Domestic incidents can happen in any community and Maryland Heights is certainly not immune from that," Maryland Heights Police Chief Bill Carson said.

Officials said Sims lived with the victims at one point. He had reportedly been kicked out of the house and, as of the stabbing, was no longer residing there. Police also said Sims was someone they had dealt with multiple times over the past four years.

According to authorities, Sims was released last May and was on parole for robbery.

Sims and Turner were found together at a St. Louis motel with the family's car. Both were taken into custody without incident and brought back to the Maryland Heights Police Department.

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