LOS ANGELES — It’s been nearly 40 years since the dread-filled tones of the “Unsolved Mysteries” theme song first hit network TV airwaves.

In that time, the celebrated documentary series has been through nearly every iteration of the TV business — and is about to embark on a new one.

Next week, “Unsolved Mysteries” will launch a video podcast in partnership with the audio and entertainment firm Audacy. The weekly podcast, which will be available on YouTube and on all podcast platforms, will release new episodes starting Oct. 29 that explore cases such as mysterious deaths and unexplained disappearances.

The podcast will be hosted by actor and TV host Jordan Murphy and will include interviews with the people involved in the case, “Unsolved Mysteries” co-creator Terry Dunn Meurer explained in a recent interview.

“We’re still trying to expand the brand and pivot,” she said. “It just feels like that’s where the industry is heading. The YouTube audience is the biggest audience out there, and we are looking for the biggest audience because we’re trying to help solve these cases. So the more viewers we can get with these episodes, the better.”

“Unsolved Mysteries” isn’t the only Hollywood player to bet on video podcasts. Spotify has bet big on video podcasts, and Netflix has added them to its platform, both of which are attempts to compete with YouTube, diversify their offerings and keep consumers tuned in.

For “Unsolved Mysteries,” the move is just the latest way the show has tried to evolve with the TV industry’s ups and downs.

The show debuted in 1987 as a series of specials NBC used to fill holes in its lineup, Dunn Meurer said. That kind of pinch-hitting meant there was no marketing or publicity to get audiences excited about the show, but viewers started tuning in anyway.

Eventually, the specials became a weekly show that aired on NBC for nine seasons before moving to CBS. “Unsolved Mysteries” also had a syndication run on cable channels Lifetime and Spike TV.

Throughout its TV lifetime, the show would highlight stories of mysterious disappearances, escaped fugitives, lost connections and even the occasional paranormal story. “Unsolved Mysteries” made appeals to viewers, urging them that someone out there “knows the truth” and encouraged them to write in with tips or new suggestions for investigation, which has resulted in tens of thousands of submissions over the years.

More recently, “Unsolved Mysteries” was revived on Netflix for three seasons, with a format focused on a single story. The series also previously had an audio-only podcast.

In addition to the video podcast, “Unsolved Mysteries” also recently produced a full-length documentary on new evidence surrounding the so-called Tylenol Killer, a 1982 case in which seven people died after unknowingly taking cyanide-filled pill capsules.

Though the method of delivery has changed, Dunn Meurer said the show’s mission remains the same. Over the years, the series has helped to directly solve more than 260 cases, she said, though many are so-called lost love cases of missed connections, as well as fugitive whereabouts and some murders.

“There’s so many mysteries out there that need attention, cases that have gone cold,” she said. “For me personally, it’s hard to not keep putting those stories out there and helping these families and law enforcement that need the help to solve these cases.”

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