From the Associated Press:

Dee Dee Warwick, a soul singer who won recognition for both her solo work and her performances with her older sister Dionne Warwick, has died. She was 63.

Warwick died Saturday at a nursing home in Essex County, said Kevin Sasaki, a family spokesman. She had been in failing health in recent months, he said, and her sister was with her when she died. Warwick had several hits on the soul and R&B charts in the 1960s and 70s, including "Foolish Fool," "She Didn’t Know (She Kept on Talking)" and a version of "I’m Gonna Make You Love Me" that was later covered by Diana Ross and The Supremes.

 Dee Dee Warwick Wikipedia entry
 YouTube video: "Dee Dee Warwick (Dionne’s sister) - I’ll Be Better Off..."
 YouTube video: "Dee Dee Warwick - Monday Monday"