Three Coffee County teens who participated in a botched robbery early last year in which a Mt. Leo man was shot to death while he slept in his bed will serve the next 18 years in prison.The youths, Charles Anthony Guess, Melvin Horne and Malik Lequan Scott, all 18 now but 17 at the time of the crime, entered pleas Monday afternoon before Circuit Court Judge Bart Stanley to charges of facilitation of murder and especially aggravated robbery. The three were given identical 18-year sentences which must be served at 100 percent without chance of early release through parole.Their sentences come for the death in January 2016 of Oswaldo Luna, 43, who was shot while he slept in his small trailer behind a business on Beersheba Street.