REVERE – A top Boston attorney has moved to preserve police audiotapes from the night Officer Daniel Talbot was murdered and hired a private detective as he prepares a defense for the 17-year-old charged as an accessory in Talbot’s death.J.W. Carney, Jr. said prosecutor Edmond Zabin assured him earlier this week that police emergency 911 tape recordings from the early morning of Sept. 29 will be saved.”It is important to preserve all communication from people with the police as well as the police among each other,” Carney said Thursday.He is defending Derek Lodie, a Raymond Road resident charged last week with being an accessory before the fact to Talbot’s murder. Lodie pleaded not guilty to the charge and is being held in the Nashua Street jail until his return to court Dec. 5.Carney vowed Tuesday to “spend the next 60 days trying to get to the bottom of what happened that tragic night.” On Thursday he said “every lawyer would immediately hire a private investigator in a case of this seriousness and I did.”No one else has been charged in Talbot’s murder, but a Suffolk County grand jury is reportedly reviewing evidence and testimony relating to the shooting.Three police officers, who sources familiar with the investigation said were with Talbot when he was killed, remain on paid administrative leave. Mayor Thomas Ambrosino said the three will return to duty once the investigation into Talbot’s death is completed.The police department daily log for last Sunday listed Sgt. Evan Franklin and Officers William Soto and Stacey Bruzzese as on leave.Reardon also said a plan for a memorial in Talbot’s name at the new police station under construction on Revere Beach Parkway is “very much in the formative stages.”He said the new station will probably include a memorial saluting Talbot and other officers like John Moretti, who was killed trying to stop a robbery in 1973.