(NEXSTAR) – Two people found dead in their Florida home Thursday have been identified as the sister and brother-in-law of Bernie Madoff, according to the Associated Press.

Sondra Wiener, 87, and her husband Marvin Wiener, 90, were both found unresponsive with gunshot wounds early Thursday morning at their home in unincorporated Boynton Beach, the Palm Beach County Sheriff’s office said in a Facebook post on Sunday.

“Detectives from the Violent Crimes Division arrived on scene to investigate further. After further investigation it appears to be a murder/suicide,” the sheriff’s office said. Officials said the cause of death will be determined by the Medical Examiner’s Office.

Sondra was the older sister of Bernie Madoff, the fraudster convicted of running a $64 billion Ponzi scheme. Madoff was infamously known for orchestrating the scheme that wiped out people’s fortunes and ruined charities. He and his firm defrauded investors for decades, until he was exposed in the financial downturn of 2008.

Madoff was sentenced to 150 years in prison after pleading guilty in 2009 to fraud and other charges. He died while incarcerated at age 82 in April 2021.

Sondra didn’t work for her brother, but her son did, according to the New York Post. A woman who identified herself as the wife of son David Wiener asked for privacy “at this time of grief.” Contacted by phone, she said: “We are not making any comment at this time.”

The elderly couple’s families have invoked Marsy’s Law, said the Palm Beach Sheriff. Marsy’s Law, which passed as a constitutional amendment in Florida in 2018, gives crime victims right to due process and freedom from intimidation, among other rights.

The Associated Press contributed to this report.