The daughter of a Long Island woman who died Saturday, nearly two years after she was bludgeoned with a barbell, has been charged with murder, along with a former business partner of the victim with whom she allegedly conspired.

Theresa Kiel, 56, of Long Beach, was attacked on Dec. 4, 2016, Nassau County police said. She lost an eye and her skull partially collapsed in the attack, which left her in a persistent vegetative state, prosecutors said.

Kiel, a former teacher, died of her injuries Saturday, 11 months after the attack.

Her daughter, 21-year-old Francesca Kiel, had never been charged in the case prior to Saturday. Prosecutors described her as a co-conspirator in the killing of her own mother. Ralph Keppler, a 27-year-old former city correction officer who had been working with the daughter and victim to create a dating app, also has been charged with second-degree murder.

Keppler had also been dating the daughter at the time of the attack, media reports say. They lived at the same address.

Keppler initially was charged with attempted murder and assault in January but that charge was upgraded after the death. 

According to Keppler's attorney, his family had invested several hundred thousand dollars with Theresa Kiel. Keppler alleges Kiel was siphoning off money; he was suing her for unspecified damages.