New details surrounding the gruesome murders of 48-year-old Ryan Callens and 49-year-old Maria Elena Callens were released during a detention hearing for the couple's 16-year-old child Tuesday in Collin County.
The teenage boy, whose name is not being revealed by NBC 5 due to his age, has been charged with two counts of murder after he was arrested at the family's home Monday.
During the hearing Tuesday morning, officials said officers responding to a shots fired call at about 2 a.m. arrived to find the teen and his sister sitting outside of their home on the 12400 block of Shepherds Hill Lane.
According to testimony read during the hearing, the teen was kneeling with his face in his hand while his sister, who appeared very upset, tried to dial her phone.
A police officer then overheard the girl say to her brother, "What do you mean you did it?" The boy replied, "I did it." The sister then asked, "Was this your plan?" There was no reply from the teen.
The girl told police there was a gun on the floor of the house as her brother gestured toward the home, police said.
Officers then went inside the home and found a man with an apparent gunshot wound and a rifle with a flashlight taped to it on the ground. Inside a bedroom police found the boy's mother with multiple gunshot wounds to her head and arm.
Following the hearing, state District Judge Cynthia Wheless granted a motion to detain the teen for 10 days while the investigation into the slayings continues.