But something happened to James...
When Jesus was alive, James didn't believe in his brother Jesus as the Son of God (John 7:5). He as well as his brothers and sisters may even have mocked him. "You want people to believe in you? Why don't you go up to Jerusalem and do your thing?" For James it must have been humiliating for Jesus to go around and bring ridicule to the family name by his wild claims" ("I am the way, and the truth, and the life; no one comes to the Father, but through Me"— John 14:6; "I am the vine, you are the branches"— John 15:5; "I am the good shepherd . . . and My own know Me"—John 10:14)...
But something happened to James. After Jesus was crucified and buried, James was preaching in Jerusalem. His message was that Jesus died for sins and was resurrected and is alive. Eventually James became one of the leaders of the Jerusalem church and wrote a book, the epistle of James. He began it by writing, "James, a servant of God and of the Lord Jesus Christ." His brother. Eventually James died a martyr's death by stoning at the hands of Ananias the high priest (Josephus). Was James deceived? No, the only plausible explanation is I Corinthians 15:7—"then He appeared to James.
~ Josh McDowell, More Than a Carpenter, p. 65