Murder Confession: Teen Copies Halloween Film

A Texas teenager has confessed to police that he shot his mother and sister after repeatedly watching a horror film about a boy who kills without remorse.

Newly released evidence in the case includes a four-page document handwritten by Jake Evans.

In it he calmly explained how he planned to kill several members of his family last October - inspired by the 2007 remake of the horror classic Halloween.

The film is about a young boy who knifes to death his sister and others, and escapes a mental hospital years later to continue killing as an adult.

"While watching it, I was amazed at how at ease the boy was during the murders and how little remorse he had," the 17-year-old wrote, just hours after the event.

"Afterward, I was thinking to myself it would be the same for me when I kill someone."

He said in the confession that he initially planned on using a knife to murder his mother Jami and 15-year-old sister Mallory at their home in Aledo.

"I went back upstairs and kept pacing back and forth imagining killing Mallory," he wrote.

"Thoughts of causing her pain kept entering my mind and were really bothering me. But then I'd think about the times she hurt my feelings."

Evans described how earlier that day, he and his sister had argued after he accused her of making a racist comment.

He said he sat on the sofa having a pillow fight with his sister with a knife in his pocket.

But then he changed his mind.

"After a while, I thought to myself that if I were to kill my mom and Mallory, I wouldn't want them to feel anything, so I decided to kill them both with the .22 revolver I stole from my grandpa," he wrote.

"I then spent probably over an hour walking nervously around the house thinking how life will never be the same and how I would never see them again."

Evans described knocking on his sister's bedroom door at about 11.15pm and shooting her in the back and head.

He then went downstairs and shot his mother.

"As I emptied the shells on my bed, I heard noises and realised that Mallory was still alive," he wrote.

"While I loaded the gun back up, I was shouting that I was sorry and then ran as fast as I could to kill her. I made sure my mom was dead and shot her again in the head."

Evans called 911 and told the dispatcher what he had done.

"I know now though that I'm done with killing," he said at the end of his statement. "What happened last night will haunt me forever."