I addressed this in THIS topic a while back <clicky>, but here's the relevent quote:So...that was his actual hair? I mean, criminey, it looks like a comb-over, which surely wasn't necessary at Walter's tender age?
Whether it was a wig or his hair, why was it styled so weirdly? Davy Jones' hair didn't look like that.
...[Walter] wore the full wig at first, til his hair grew out. But at some point he started wearing a rug to cover a bald spot he had as early as his audition. As he related on page 180 of "Warped Factors" (hardcover):
He [Fred Phillips] leaned closer. "Your hair is thinning in the back. You better come with me."
...He whipped out a can of something called Nestles, Streaks and Tips. The brown spray covered the island of withering follicles at my crown and thus began my life of deception on Star Trek: ... and the resolute assault of male-pattern baldness was, at least temporarily, obscured by the magic of the paint can.