Mary Weiss, the Shangri-La's frontier, passed away at the age of 75.
According to Variety, her death was confirmed by Miriam Linna from Norton Records, who also released Weiss' only solo album in 2007.
The outlet reported that the cause of her death has not yet been revealed.
In a tribute to Weiss, who led the sixties New York band, Linna wrote, "Mary was an icon, a hero, a heroin, to both young men and women of my generation and of all generations."
As per Deadline, taking her grief following the demise of Weiss, Linna also penned a post on Facebook that read, "remembering Mary Weiss with much love and affection."
She ended the minimalistic caption, "Mary was the ultimate" pop performer.
Weiss was widely acclaimed after her days in one of the legendary girl groups of the early 1960s that treated her fans to iconic musical feasts, including Leader of the Pack, Great Big Kiss, Remember (Walking in the Sand), and Heaven Only Knows.
Until 1968, she served as the lead singer and focal point of Shangri-Las; by that year, the band was disbanded because of litigation, a subject that Wiess said she was prevented from discussing even decades later.
She made a comeback to the music scene in 2007 with her debut solo album, Dangerous Game, and grabbed the opportunity to appear at the South by Southwest in Austin.
Though the fan favourite group's time of peak success and popularity did not last long, it was only from 1964 to 1965, but they left an indelible mark on the industry with their vocal talent.
The Leader of the Pack garnered them countless imitations and led to their induction into the Rock and Roll Hall of Fame.