A total of 18 people were convicted and sentenced to life imprisonment in the sensational Karim murder case in Shibgonj Upazila of Chapainawabgonj district.Rajshahi Divisional Speedy Trial Tribunal Judge Golam Ahmed Khalilur Rahman found the convicts guilty of the murder charge beyond doubt and pronounced the verdict in presence of them here on Tuesday.Twenty other accused of the case were acquitted as charge brought against them could not be proved.The convicts are: Monirul, Shantijul, Bairul, Ansar, Anwarul, Sadequl, Laddu, Ataur, Bakkar, Jalal, Moni Alam, Bakul, Ziaur Rahman, Bishu, Matin and Alam.The prosecution story, in brief, is that the accused in collaboration with each other killed Abdul Karim, caretaker of mango garden owned by Naimul Haque, in Chalk Kirti village under Shibgonj Upazila on August 18, 2010.Later on, Naimul Haque lodged a murder case with Shibgonj Police Station in this connection.After completion of investigation police pressed charges accusing 39 persons.The court examined recorded depositions of the prosecution witnesses and other relevant evidences and handed down the verdict this noon.