Francesca Hilton, the only child of sexy 1950s movie star and perennial celebrity Zsa Zsa Gabor, has died at 67.
Lozzi said he had been chatting with Hilton by phone just minutes before she was stricken.
"We were discussing her book she was writing and a possible deal," he said. "She had to go to the restroom. She never made it out."
He said Hilton's fiance administered CPR until paramedics arrived.
Born in New York in 1947, Constance Francesca Gabor Hilton worked at various times as an actress, photographer and publicist, and was a familiar presence at her mother's side at public events throughout much of the 1980s and '90s.
She appeared in small parts in a handful of movies, including "Forever Fabulous," ''Pterodactyl Woman From Beverly Hills" and "Liz: The Elizabeth Taylor Story."
More recently she fought a long-running legal battle with her mother's husband, Frederic von Anhalt, over control of Zsa Zsa Gabor's finances and medical care. At one point, a judge ordered von Anhalt to allow Hilton to visit her 97-year-old mother.
Zsa Zsa Gabor, the Hungarian-born beauty queen and star of such 1950s films as "Moulin Rouge" and "Queen of Outer Space," has been in declining health since being badly injured in a traffic accident in 2002.
Funeral arrangements for Francesca Hilton were pending.