[video=youtube;FBn1uQJq7L4]https://www.youtube.com/watch?v=FBn1uQJq7L4[/video] A chilling recording of a 911 call captured a 17-year-old Texas boy telling the operator in a calm, monotone voice that he had just shot his mother and sister multiple times. Jake Evans, 17, has been charged with capital murder in the deaths of his mother and 15-year-old sister and remained jailed Friday without bond. The double slaying in the family's upscale home in Aledo, about 20 miles west of Fort Worth, happened while Evans' father was out of town on business and his two older sisters were not home. The motive remains "a big mystery," Parker County Sheriff Larry Fowler said Friday. During a 25-minute call to a 911 operator that started about 12:30 a.m. Thursday, Evans calmly says he just shot his mother and sister with a .22 revolver. He answers "yes" when asked if he's sure they are dead. "It's weird," he says as the operator continues asking questions. "I wasn't even really angry with them. It just kind of happened. I've been kind of planning on killing for a while now." He adds that he could have shot "pretty much anybody." When asked why, he says first that he doesn't know but then says he doesn't like people's attitudes. Evans tells the Parker County 911 operator that his mother and sister were rude, but he also says his sister, Mallory, had a really sweet side. "This is probably selfish of me to say, but to me, I felt like they were suffocating me in a way," he says. "Obviously, you know, I'm pretty – I guess – evil." Evans describes shooting his mother several times and then, as his sister screams, shooting her in the head three times. He recalls apologizing to her and telling her to "hold still ... that, you know, I was just going to just make it go away." Toward the end of the call but before deputies arrive at his house, Evans tells the operator that he's "going to be messed up." He says he's worried about having nightmares and asks if there's medication to treat that. "I don't mean to sound like a wimp or anything, but this is – wow. I've never done anything violent in my life, you know?" he says. Later, he's heard taking deep breaths, as the operator has instructed. "I just thought it would be quick, you know? I didn't want them to feel any pain. That's why I used a gun, but it's like everything just went wrong." Fowler said Evans was the only suspect in the deaths. Evans and his sister Mallory were being home-schooled. Evans had played on the golf team before withdrawing from Aledo High School in January. He played football in middle school. Mallory Evans "was a sweet child that will be missed by her friends and school family," Aledo schools superintendent Doug Manning said in a statement. Jami Evans, 48, was an elementary teacher and assistant principal for the Aledo school system for 15 years, and "her dedication to her students and her love of learning was an inspiration to all who knew her," Manning said. Operator was a true pro.