The Danbury Police Department is mourning the loss of another officer.  Andrew Katkocin passed away unexpectedly yesterday morning.  Spokesman Lt Mark Williams said in a statement that the 12-year veteran of the department was well-liked and respected by his peers and supervisors alike.  Williams called Katkocin's passing a stunning blow to the Department.   45-year old Sgt David Cooney passed away last Sunday after a year long battle with Leukemia.  As Danubry mourns the two losses, other police agencies are helping out.  Other police departments will be patrolling within Danbury and responding to requests for assistance in order to make it possible for Danbury personnel to attend services for both officers.  The augmented service is temporary and will end when services are complete.  A Mass of Christian Burial for Cooney  will be celebrated at 11am at St. Gregory the Great Church in Danbury. Burial will follow in St. Peter Cemetery.