Can a Christian die a horrible death (plane crash, ghastly car accident, etc.)?
Yes, some faithful Christians die what would be called horrible deaths—and others are delivered from them. None of us know when, or how we will die—or if the Lord will catch us up in the Rapture.
Notice the following passage. Hebrews 11:31-40 says, “By faith the harlot Rahab perished not with them that believed not, when she had received the spies with peace. And what shall I more say? for the time would fail me to tell of Gedeon, and of Barak, and of Samson, and of Jephthae; of David also, and Samuel, and of the prophets: Who through faith subdued kingdoms, wrought righteousness, obtained promises, stopped the mouths of lions, Quenched the violence of fire, escaped the edge of the sword, out of weakness were made strong, waxed valiant in fight, turned to flight the armies of the aliens. Women received their dead raised to life again: and others were tortured, not accepting deliverance; that they might obtain a better resurrection: And others had trial of cruel mockings and scourgings, yea, moreover of bonds and imprisonment: They were stoned, they were sawn asunder, were tempted, were slain with the sword: they wandered about in sheepskins and goatskins; being destitute, afflicted, tormented; (Of whom the world was not worthy:) they wandered in deserts, and in mountains, and in dens and caves of the earth. And these all, having obtained a good report through faith, received not the promise: God having provided some better thing for us, that they without us should not be made perfect.”
Of these who have died such horrible deaths for the Lord, God says that the world was not worthy of these people, and that they have “obtained a good report through faith.”