Police have issued an arrest warrant for a third person, a 17-year-old Sherman boy, in the shooting that left a Denison boy dead and his brother critically injured Sunday evening.

Denison Police Lt. Mike Eppler said an arrest warrant has been issued for Antonio Prado, Jr, 17, of Sherman, for capital murder of a child younger than 10 years of age.

Ryan Clay, 18, and Sabrina Nino, 17, are also facing charges of capital murder of a child younger than 10 years of age. Eppler said they were both arrested Monday afternoon.

"Prado also goes by the nickname “Chapo,” and he should be considered armed and dangerous," Eppler said.

Police are asking for anyone with information on Prado's whereabouts to contact the Denison Police Department at 903-465-2422.

This comes after the shooting late Sunday night that left 5-year-old Kason Powell dead, and his 11-year-old brother, Zaquavian Fisher, critically injured.

Police said multiple rounds were fired into a home in the 1700 block of West Elm Street in Denison around 11 p.m. Sunday. The boys were struck by the gunfire while inside the house.

Police said their investigation has led them to conclude it was a quarter ounce of marijuana that led to the drive-by shooting.

According to an arrest affidavit, Zaquavian's 18-year-old brother contacted Nino about buying the marijuana.

When they went to make the deal Sunday night at the Sherman Walmart parking lot, the affidavit states a group of people took the weed and drove off without paying.

According to the affidavit, Nino had purchased the marijuana from Prado, and when she went to his house and told him what happened, she, Prado, and Clay went to the home on West Elm in Denison to confront the group who had stolen the marijuana.

Nino told police it was at the Denison house where Prado and Clay fired multiple rounds inside the house, striking the two boys.

Eppler said police are still investigating. "The investigation is still ongoing and there is a lot more to do on it," he said. "Other arrests could be forthcoming."

Stay with News 12 for the latest developments.