Final answer:
In the film 'Walk the Line', Johnny Cash is the one who was preceded in death by his wife June Carter by four months, with both passing away in 2003.
Step-by-step explanation:
In the biographical film "Walk the Line", the person who was preceded in death by his beloved wife June Carter by 4 months, both passing away in 2003, is a) Johnny Cash. Johnny Cash was a renowned American singer-songwriter who married June Carter, a fellow music icon. The relationship between Johnny Cash and June Carter was depicted in the biographical film, highlighting both their professional collaborations and deep personal bond. They left a significant legacy in the world of country music, and their love story is still celebrated today.