NBC10 in Philadelphia is reporting that the excavator operator accused of being under the influence of drugs the day of the June 2013 deadly building collapse on Market Street in Center City pleaded guilty Tuesday to charges including involuntary manslaughter and causing a catastrophe.

The admission wasn’t enough for the family of one victim.

Sean Benschop, 44, was arrested in the wake of the collapse. Investigators believe the vibration from his excavator caused a four-story brick wall to collapse onto an adjacent one-story Salvation Army thrift store at 22nd and Market streets, burying shoppers and employees in debris. One woman lost both legs after spending nearly 13 hours in the rubble.

"The loss of a child is incomprehensible for any parent; and our pain is compounded with the knowledge that so many people, businesses, and organizations were either involved, knew of, and/or chose to ignore the looming, deadly danger," said Bryan’s parents Nancy Winkler and Jay Bryan in a statement. "Sean Benschop’s conduct was unforgivable."

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