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UPPER MARLBORO, Md. (WUSA/AP) - A D.C. police officer involved in a paternity dispute who shot the mother of his child and left the baby to die in a hot car has been found guilty of first degree murder, according to the Prince George's County State's Attorney.

Richmond Phillips was found guilty late Thursday of 1st degree murder of Wynetta Wright and her child Jaylin in June 2011. He was found guilty on all counts including the use of a handgun and child abuse.

Prince George's County, Md., State's Attorney Angela Alsobrooks said during opening statements on Monday that Richmond Phillips killed the two because he didn't want to pay child support. Phillips was being tried on two counts of first-degree murder along with child abuse and firearms charges.

Phillips was arrested in June 2011 after the body of 20-year-old Wynetta Wright was found in a park where the two had met. Their child, Jaylin, who was days shy of her first birthday, was found dead in her car seat with the doors closed and windows rolled up.

Defense lawyer Brian Denton had told jurors that his client was innocent and that the evidence was circumstantial.

The sentencing is scheduled for March 22. Phillips faces a double life term without parole, plus 20 years.