God's permissive will allows for a person to die before he becomes an actual member. Even though that is opposed to His actual will. God does not force anything.
A non-member who dies within the Church becomes a member of the Church Suffering or the Church Triumphant at death.
A non-member can not be "joined to" "within" or "attached" to the Church unless he has a supernatural faith and perfect charity and dies in a state of sanctifying grace, if he dies in this state he is baptized with the baptism of the Holy Ghost otherwise known as the baptism of "desire" and becomes a full fledged member of the Catholic Church Suffering or Triumphant.
This is Novus Ordo double speak perfectly exemplified.
A non-member remains a non-member so long as he rejects the graces offered to become a member, or would be offered if he were to accept them.
A non-member dies outside the Church, not within it and has no chance for salvation - that's the fate which awaits all non-members (and even most members).