LOS ANGELES — Nancy Sinatra Sr., the childhood sweetheart of Frank Sinatra who became the first of his four wives and the mother of his three children, has died. She was 101.

Her daughter, Nancy Sinatra Jr., tweeted that her mother died Friday and a posting on her Web page said she died at 6:02 p.m. but didn’t indicate where she died.

“She was a blessing and the light of my life,” her daughter said.

Attempts to reach representatives for Sinatra Jr. late Friday were unsuccessful.

Nancy and Frank Sinatra had been dating as teenagers and married at Our Lady of Sorrows Catholic church in Jersey City, N.J., on Feb. 4, 1939, just as Frank’s singing career was about to take off. Three years before marrying the former Nancy Barbato, he had landed a 15-minute radio show on local station WAAT.

During the marriage’s early years, the Sinatras lived in a modest apartment in Jersey City, where their two eldest children were born.