A Las Vegas teen has been jailed for up to 40 years for a savage attack on his teacher where he raped and strangled her before trying to slash her wrists. Jonathan Martinez-Garcia, 17, smirked at his sentencing Wednesday as the court heard in harrowing detail how he ambushed the teacher by asking if he could speak about his grades after class at El Dorado High School in April 2022. Martinez-Garcia waited until her back was turned before trying to choke her with a 'rope or string'. He then slammed the young woman's head against a table, knocking her unconscious....