The NTSB has released its report on the crash that killed prominent Buffalo attorney Steve Barnes and his niece in October of 2020.
According to the report, communication with the plane had been disrupted for some time before Barnes radioed that he was about 15 minutes out of Buffalo and all was well. Shortly afterward the plane went into a sudden dive before crashing.
While the report does not identify the cause of the crash, it says that there was no sign of drugs or alcohol in Barnes’ system at the time of the crash.
You can find the full report at this link.