The 2399 death of the crime boss Bjayzl, killed by Seven of Nine on Freecloud in revenge for the murder of her protege Icheb.
Bjayzl was a criminal who dealt in black-market Borg implants. Years before 2399 she had Icheb, Seven of Nine's protege from the USS Voyager, captured and his implants cut from his body while he was still alive. Seven reached him too late and had to end his suffering herself.
In 2399 Seven helped Picard's crew rescue Bruce Maddox from Bjayzl's base on Freecloud. Once the rescue was done she returned and killed Bjayzl, ending her long hunt for the woman responsible for Icheb's death.