A Plainview woman accused of driving high on methamphetamine through a red light, killing a Farmingdale man on his way to the beach, has pleaded guilty to manslaughter and assault charges. Cassandra Panetta, 41, entered her plea to second-degree manslaughter, second-degree assault, and driving while ability impaired by drugs, closing out a case that began with a six-count indictment less than a year before her plea.
Panetta formally admitted guilt in Mineola court on Friday, September 18, 2026, before Acting Supreme Court Justice Helene Gugerty, according to Newsday. The plea stems from an August 10, 2025 crash at the intersection of Carman Avenue and Salisbury Park Drive in East Meadow, where Panetta allegedly drove her 2012 Nissan Maxima through a steady red light and struck the rear driver's side of a 2024 Nissan Altima carrying Steven Diamond and two others; the Altima had a green light, as detailed in the original report from Shore News Network.
Diamond, a 55-year-old Farmingdale resident, was riding in the backseat of his friends' car on a Sunday afternoon trip to the beach when the collision occurred around 1 p.m., according to Daily Voice. He went into cardiac arrest when paramedics arrived and was taken to Nassau County Medical Center in East Meadow, where he was pronounced dead at 3:13 p.m., per the same account. The crash left the driver of Diamond's vehicle with a concussion, while the front-seat passenger suffered minor injuries. Panetta herself suffered a fractured wrist, and a hospital blood test reportedly came back positive for methamphetamine and amphetamine.
Indictment Reduced Through Plea Deal
Nassau County Police Department Homicide Squad detectives arrested Panetta on October 17, 2025, roughly two months after the crash, according to the Shore News Network account. The arrest followed a grand jury indictment on six counts that included second-degree vehicular manslaughter, third-degree assault, and reckless driving, the Nassau County District Attorney's office noted. The plea included second-degree manslaughter and second-degree assault, which were among the original indictment charges, as well as DWAI drugs; vehicular manslaughter was dropped as part of the disposition.
Following her indictment, Panetta had pleaded not guilty and was held on bail set at $500,000 cash, $750,000 bond, or a $1 million partially secured bond, per the Nassau County District Attorney's office. Nassau County District Attorney Anne Donnelly said Panetta was high on methamphetamine when she drove through a red light and crashed into the car carrying Diamond, and she expressed sympathy for Diamond's family. Senior Assistant District Attorney James Taglienti of the Vehicular Crimes Bureau is prosecuting the case, while attorney Marc Gann represents Panetta.
Sentencing Set for December
Panetta is scheduled to return to court for sentencing on December 8, 2026. Prosecutors have recommended a sentence of six to 12 years, though she is expected to receive four to 12 years in prison, according to prosecutors cited by Shore News Network. Under New York Penal Law § 125.15, second-degree manslaughter is classified as a Class C felony carrying a statutory state prison term ranging from 3.5 to 15 years, according to the Marwaha Law Group.
Donnelly has publicly described drug-impaired driving as a deadly epidemic on Nassau County's roadways and has pushed for legislative reforms to strengthen New York State's impaired-driving statutes, according to the Nassau County District Attorney's office. A 2024 research paper cited by Hoodline found that drug-related fatalities accounted for 23% to 25% of motor-vehicle fatalities in 2020 and 2022. Preliminary traffic safety data compiled by Newsday from police releases recorded 62 roadway fatalities in Nassau County through late 2025, a slight increase over the same period the year before, with serious injuries also rising across Long Island.
Part of a Broader Crackdown
The Panetta case fits a pattern of aggressive prosecutions Nassau County has pursued against drivers impaired by controlled substances. Hoodline previously reported on a Glen Cove driver's guilty plea in a separate case where a woman admitted to aggravated vehicular homicide and drug-impaired driving after killing two motorcycle riders while high on cocaine and Xanax. Both cases involved drivers impaired by controlled substances causing fatal midday collisions, underscoring the recurring role toxicology plays in Nassau County's vehicular crimes prosecutions.
