Gladys Horton, member of the classic Motown female group Marvelettes popularized the song Please Mr. Postman died at the age of 66.

The cause of death of Gladys Horton is still unknown but  it was reported that she was still recovering from complications due to a stroke she suffered last year, her son told the Associated Press.

The quartet Marvelettes successfully make it to the recording business after their second audition in which they sang 'Please Mr. Postman,' which became a hit. The song was co-written with Dobbins' friend and songwriter William Garrett. The song became famous included its album which skyrocketed to the top of the charts.

"My mother died peacefully," Horton's son, Vaughn Thornton, said Thursday morning in a statement released by the Motown Alumni Association. "She fought as long as she could." She is survived by Vaughn and another son. Funeral arrangements are pending.

Watch Gladys Horton and fellow member of the Marvelettes performing Please Mr. Postman.