The father of a 2-year-old gunned down with her mother in a parking lot outside their Maryland home was arrested Wednesday in connection with the case, Fox 5 reported.

NeShante Davis, 26, and her daughter, Chloe Davis-Green, were found in the Fort Washington parking lot Tuesday morning. The girl's father, identified as Daron Maurice Boswell-Johnson, reportedly owed the mother monthly payments of $600 in child support.

The mother was on her way to drop off her daughter at daycare, relatives tell Fox 5.

Parents described Davis to media outlets as a beloved and patient teacher and one boy says he and his classmates cried when they learned she wouldn't be coming back.

"This is absolutely unacceptable, in any civilized community, that a child should be killed in this way," State's Attorney Angela D. Alsobrooks said Tuesday.

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The Associated Press contributed to this report.