david adam pate from lancaster , north carolina , killed ricky james in 2013 .
lured him into some woods with wine before knifing him 39 times .
dumped his body in a creek , but it was found a month later by children .
told police he used a knife ` like the one michael myers used in halloween '
25-year-old pleaded guilty to the brutal slaying in court on thursday .
victim 's brothers said they hope he suffers in prison and is the ` devil '
one of them stormed out of court screaming after testifying at sentencing .