Liza Minnelli cried for eight days after Judy Garland died

"Liza: A Truly Terrific Absolutely True Story," which premiered at Tribeca Film Festival, explores the ups and downs of Liza Minnelli's life.

Garland's life was buffeted by decades of substance abuse, including a pill addiction that began during her days as a child star when she was plied with amphetamines to work up to 72-hour shifts.