I cannot know who would be a son of perdition, only God has the right to make that judgement.
The only two people I believe that are identified in scripture as Perdition are Lucifer and Cain. (D&C 76:26; Moses 5:24)
Both rebelled against God willingly and knowingly.
Jesus refers to Judas as the Son of Perdition (John 17:12) and said that it were better for him that he had not been born. (Matthew 26:24)
Norman - please address point #2 below -
The followers of Satan who will suffer with him in eternity. Sons of perdition include (1) those who followed Satan and were cast out of heaven for rebellion during premortality, and (2) those who were permitted to be born to this world with physical bodies but then served Satan and turned utterly against God. Those in this second group will be resurrected from the dead but will not be redeemed from the second (spiritual) death and cannot dwell in a kingdom of glory (D&C 88: 32, 35).
http://scriptures.lds.org/gs/s/82
Is not turning away from mormonism after being once a mormon considered being ‘utterly against God’ as many of your prophets have taught as well.
In MORMON scripture...
But in CHRISTIAN Scripture - just JUDAS.