The Board of Selectmen, by unanimous vote, have named Assistant Town Manager Bob LeLacheur to be Reading’s next town manager. LeLacheur, who was among three finalists for the position, will replace Peter I. Hechenbleikner when he retires in June after serving as town manager for 26 years. A screening committee, with help from a consultant, whittled a list of about 25 candidates down to the final three. The other finalists were Abington Town Manager John D’Agostino and Lunenberg Town Manager Kerry Speidel. LeLacheur has worked in Reading since 2005. Prior to that, he was a portfolio manager and partner for Merganser Capital Management Inc. in Cambridge and Boston. He also had worked on Wall Street, at Salomon Brothers and Lehman Brothers.