A teen who shot a sleeping man to death when he was just 17 years old will serve the next 35 years in prison after pleading guilty to second-degree murder on Friday.Sam Brinkley, now 18, received the sentence, which is to be served at 100 percent. Considering he has already served one year in jail, time which will go to his credit, Brinkley will be released at age 52 if he does in fact serve his full term.Brinkley shot to death Oswaldo Luna, 43, as he slept in his trailer in Mt. Leo.