Fish!

That's the answer then, to the latest 70s legend to pass...
David Bowie, Glenn Frey, and Fish!  aka Abe Vigoda.

On a dark deserted highway:
cool winds nip my ears...
Sharp smell of nostaglia,
wafting up through the years...
In the American heartland,
I heard the radio sing!
Turned on my free tv set,
saw New York and everything...

Then again, maybe Vigoda is the final third of the Jack Soo/Steve Landesberg death trio?  Remember them.
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Vigoda once remarked: "When I was a young man, I was told success had to come in my youth. I found this to be a myth. My experiences have taught me that if you deeply believe in what you are doing, success can come at any age."

^~~~~~

In acknowledging that Landesberg was actually nine years older, his daughter Elizabeth said he had provided varying birth dates over the years. "He got kind of a late start in show business," she explained, "so he tried to straddle the generations. He fooled the whole world. People were surprised to think he was even 65." Landesberg commented on the issue in a 1979 Washington Post profile for which he refused to give his age:

"Let's just say I started late. It hurts you with casting directors.… If you tell them your age—let's say you're middle-aged—and they've never heard of you, they figure you're no good, or else they would've heard of you already. I tell my friends not to tell their ages." 

~~~~

Jack Soo was born Goro Suzuki on a ship traveling from Japan to the United States in 1917. He lived in Oakland, California, and was caught up in the Japanese American internment during World War II. He was sent to the Topaz War Relocation Center in Utah; and fellow internees recalled him as a "camp favorite", an entertainer singing at dances and numerous events.

Soo's career as an entertainer began in earnest at the end of the war, first as a stand-up nightclub performer primarily in the Midwestern United States. He changed his name to Soo after working at a Chinese night club. During his years playing the nightclub circuit, he met and became friends with future Barney Miller producer Danny Arnold, who was also a performer at the time.
...
Soo was diagnosed with esophageal cancer during Barney Miller's fifth season (1978–79). The cancer spread quickly, and Soo died on January 11, 1979, at age 61, at the University of California at Los Angeles Medical Center. His last appearance on the show was in the episode entitled "The Vandal," which aired on November 9, 1978.

...

Soo's last words came after being given a truly thankless chore by Captain Miller (which Nick always seemed to be the beneficiary of in the series), Barney senses Nick's desire to complain and invites him to do so. On the wall, in the background during the entire episode is a spray-painted obscenity aimed at Captain Miller courtesy of the vandal (and which everyone feels the need to comment on during the episode). Nick, having been given the open invitation by Barney for a retort, glances at the obscenity on the wall and then simply says to Barney: "I have nothing to add".

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BUT BACK TO VIGODA, who died today at 94:

He liked to tell the story of how he won the role of Detective Fish. An exercise enthusiast, Vigoda had just returned from a five-mile jog when his agent called and told him to report immediately to the office of Danny Arnold, who was producing a pilot for a police station comedy.

Arnold remarked that Vigoda looked tired, and the actor explained about his jog. "You know, you look like you might have hemorrhoids," Arnold said. "What are you - a doctor or a producer?" Vigoda asked. He was cast on the spot.

"The Complete Directory to Prime Time Network and Cable TV Shows," a reference book, commented that Vigoda was the hit of "Barney Miller."

"Not only did he look incredible, he sounded and acted like every breath might be his last," it said. "Fish was always on the verge of retirement, and his worst day was when the station house toilet broke down."

Vigoda remained a regular on "Barney Miller" until 1977 when he took the character to his own series, "Fish." The storyline dealt with the detective's domestic life and his relations with five street kids that he and his wife took into their home.

The show lasted a season and a half. Vigoda continued making occasional guest appearances on "Barney Miller," quitting over billing and salary differences.

The Last Word...

"I'm the same Abe Vigoda," he told an interviewer. "I have the same friends, but the difference now is that I can buy the things I never could afford before. I have never had a house before, so now I would like a house with a nice garden and a pool. Hollywood has been very kind to me."