(CNN) A Missouri man shot and killed his 8-month-old son during an argument with his wife, then fled with two of his other sons in a rental car, St. Louis Metropolitan Police Department Chief Sam Dotson said Tuesday.

Those boys later were found unharmed at a relative's house, police said.

Diata R. Crockett, 34, went missing in a rented black Hyundai Sonata and is considered armed and dangerous. The car was later recovered.

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Dotson said the incident started as an argument in which Crockett's wife told police she felt forced to get into the car with three of their six children.

At one point, the wife tried to get out of the car while holding the baby, Reign Crockett, and the father fired one shot toward her, Dotson said.

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