Over the years we have lost many members of the cast and voice actors of Power Rangers.
Here is the list of the members of the Power Ranger Universe we have lost over the years.
(Source)


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Robert L. Manahan
August 23, 1956 – June 30, 2000 (Age: 53) 
Was the voice of Zordon from Mighty Morphin’ Power Rangers to Power Rangers In Space


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Eric Frank
October 14th 1971 – April 16th 2001 (Age: 29)
Played David Trueheart, the brother of Tommy Oliver, in Power Rangers Zeo
(He is also the real-life brother of Jason David Frank) 


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Thuy Trang
December 14th 1973 – September 3rd 2001 (Age: 27)
Played Trini Kwan the Original Yellow Ranger in Mighty Morphin’ Power Rangers 


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Jack Banning
August 21st, 1931 – July 10th, 2005 (Age: 73)
Played Professor Phenomenus in Power Rangers in Space & Power Rangers Lost Galaxy 


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Bob Pappenbrook
September 18, 1955 – March 17, 2006 (Age: 50)
Best known for his voice work as Rito Revolto & Deviot as well as many monsters Power Rangers Zeo – Power Rangers Wild Force 


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Machiko Soga
March 18th 1938 – May 7th 2006 (Age: 68)
Played Rita Repulsa in the Zyuranger adapted scenes of Mighty Morphin’ Power Rangers as well as Mystic Mother in the Magiranger adapted scenes of Power Rangers Mystic Force 


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Edward Laurence Albert
February 20th 1951 – September 22nd 2006 (Age: 55)
Played Mr. Collins in Power Rangers Time  Force 


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Richard Genelle
October 12th 1961 – December 30th 2008 (Age: 47)
Played Ernie, the owner of the Angel Grove Juice Bar and Youth Center from Mighty Morphin’ Power Rangers to Power Rangers Turbo 


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Peta Rutter
December 31, 1959 – July 20th 2010 (Age: 50)
Played Udonna the White Mystic Ranger and mother to Nick in Power Rangers Mystic Force 


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Maurice Mendoza
July 26, 1974 – August 13, 2013 (Age: 39)
Played Richie, Trini’s love interest and juice bar server, during Mighty Morphin’