Updated

The family of one of six people killed in an attack on a Minneapolis office last year is suing the company and the attacker's estate.

Family members of Jacob Beneke contend in their lawsuit that Accent Signage Systems should have known that the attacker, Andrew Engeldinger, had violent tendencies, was mentally unstable and was a potential danger to others.

Among other things, the family claims the company was negligent when it notified Beneke a week before the September attack that he could be fired and it failed to arrange for extra security on the day he was dismissed.

The Associated Press obtained a copy of the lawsuit in advance of Friday's formal announcement. It's being filed in Hennepin County.

A message left with Accent Signage was not immediately returned.