steven b. williams was a man with a golden voice. er deejay who found fame, fortune, and a wealth of friends. then suddenly, radio silence. steven b. had disappeared. detectives would follow a trail of clues from the coast of california to a quiet town in montana. they thought the motive was good old fashioned greed. but the key to this mystery remained stubbornly out of reach. the question was, would anyone ever find it? here's keith morrison with "who killed the radio star? " >> down below the surface of the pacific ocean, on the far side of california's catalina island, is a silent current. strange, how it flows up to the swelling coastline of santa barbara. then, just before the open sea, turns back to glide again past this storied island. with, one sunny day in may 2006, someone in it. >> i have a saying that i'd rather be lucky than good. >> ken clark is a detective with the l.a. sheriff's department. been at it a long time. as has robert martindale. more than 50 years between them. but nothing like the case that literally float