Teen stabs grandmother over 90 times, wanted to upset uncle

LAKE WALES, Fla. - Police say a central Florida teen stabbed his grandmother more than 90 times, struck her in the face with a wrench, and then shot her in the head with a crossbow.

The Polk County Sheriff's Office reports that 19-year-old Jasper Aristotle Smiddie was arrested Wednesday morning and charged with first-degree murder.

According to authorities, Smiddie's father contacted authorities Tuesday. He said Smiddie had called him and confessed to killing 67-year-old Gloria Helfrich. Smiddie lived with his grandmother in a Lake Wales home.  This is where deputies found the body.

CBS affiliate WTSP reports that according to authorities, Smiddie even ate dinner and watched movies with his uncle that night, with his grandmother dead in her room. The uncle thought she was at work, since she usually works overnight.

Authorities say Smiddie didn't like his uncle and was planning to kill him, but instead decided to kill his mother, Smiddie's grandmother, to inflict more pain on him.

Fox News reports Sheriff Grady Judd said, "He decided, 'Well, I'll kill my grandmother instead so that my uncle has to live with the death of his mother for the rest of his life."

Smiddie was arrested after he was spotted near his girlfriend's home.

Copyright 2012 Associated Press