Connie Francis, a pop star of the late 1950s and early 1960s known for hits such as 'Who's Sorry Now,' has died at 87 due to undisclosed causes.

The legendary singer Connie Francis passed away on Wednesday at age 87. Now, new details have emerged about her final days.

Inside 'Pretty Little Baby' Singer's Final Days Before Death at Age 87 originally appeared on Parade. "Pretty Little Baby" ...

Connie Francis' loved ones were "expecting" her death.

"She slipped away peacefully," Francis' close friend, Ron Roberts, tells PEOPLE following the singer's death at age 87 ...

Legendary singer Connie Francis’ close friend says she was “smiling” in her final days, knowing she left the world “as big a star” as ever.

Known for crooning songs such as “Stupid Cupid”, “Pretty Little Baby” and “Mama”, singer Connie Francis has passed away aged ...

Tom Francis played his final performance in Sunset Blvd. on Sunday evening, July 6. Watch a video of his final curtain call, including a speech from Nicole Scherzinger, here!

Connie Francis is recovering after she was hospitalized. The Belleville NJ native had to cancel a July 4 radio appearance.

Connie Francis is recovering after she was hospitalized. The Belleville NJ native had to cancel a July 4 radio appearance.