An assurance of salvation question

Say a person comes to believe in their heart that Jesus is the eternal Son of God, that He died for our sins, rose again, and that He is coming back to judge the living and the dead, to reward the righteous and punish the wicked. Upon believing this, God fills them with The Holy Spirit. By the grace of God, and by walking according to The Holy Spirit, they become more holy everyday for the rest of their life. They die in this state. They die believing in the gospel in their heart and with The Holy Spirit living inside them.

Can a Roman Catholic affirm that this person, regardless of any denominational affiliation or sacramental participation, will absolutely go to Heaven, with complete and total assurance and a 100% guarantee of their salvation?

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Recommended Reading:

[LIST]
*]Assurance of Salvation?
*]Why Catholicism Is Preferable to Protestantism
*]Assurance of Salvation in a Pinch
*]Pillar of Fire, Pillar of Truth
*]Born Again - The Bible Way
[/LIST]

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