Robert LiMandri tells The New York Times (http://bit.ly/yIHr1A ) that a maintenance company did repair work on the elevator just before the Dec. 14 accident.
He says that based on the investigation thus far, the repair work was believed to be a contributing cause, or the cause, of the accident.
Suzanne Hart was killed at the 26-story Manhattan office tower. She worked for Y&R, the advertising agency formerly known as Young & Rubicam.
The Manhattan district attorney also is investigating. No charges have been filed.
