Danbury police officers responded to Memorial Drive around 9:30 p.m. to investigate a report of a suspicious male and found a man with a knife outside the property, according to state police.
After a brief confrontation, one officer used a stun gun but it did not work and another Danbury police officer fired several rounds from his duty pistol, hitting the man at least once, according to state police.
A female relative of Arbitelle who lives in the building suffered a gunshot wound as a result of the discharge of the officer's weapon, state police said.
Both people were transported to Danbury Hospital, where Arbitelle was pronounced dead, police said.
Police said Arbitelle’s last known address was on Coal Pit Road in Danbury.
The female who was shot was listed in critical but in stable condition, state police said.
At the request of the Danbury State’s Attorney’s Office the Connecticut State Police Western District Major Crime is investigating.