For the first time, a high-ranking Spokane police official has publicly acknowledged that the department made troubling mistakes while investigating the 2006 confrontation that killed Otto Zehm. Interim Chief Scott Stephens, who in 2006 was in charge of the detectives assigned to the investigation, also acknowledged his “concern” that at the time Assistant City Attorney Rocky Treppiedi had greater access to the investigation than he did. Mayor David Condon, who took over City Hall in January, put an end to that kind of unfettered access to criminal investigations by city attorneys, Stephens said.