Soap star Marcy Walker -- best known as Liza Colby on "All My Children" is in need of "serious medical care" ... this according to her former costar. Word of Marcy's health issues first got out back in May, when her "Santa Barbara" costar, A Martinez , addressed why they were charging for their June 7 live stream. Martinez said in an Instagram video ... "Marcy has been ill and is working hard to get well." He explained Marcy "has come face-to-face with the financial challenges that so often

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