Mark V. Tranquilli, Esquire
Deputy District Attorney of Homicide
Mark V. Tranquilli has served as the head of the Homicide Unit of the Allegheny County District Attorney’s Office since April, 2005. In his current position, Mr. Tranquilli is responsible for the approval of all arrest and search warrants for homicides committed in Allegheny County. He also assigns and supervises junior prosecutors to handle a caseload that numbers in excess of 130 active homicides at any given time.
As the chief homicide prosecutor in Allegheny County, Mr. Tranquilli personally tries most of the murder cases in which District Attorney Stephen A. Zappala, Jr. decides to seek the death penalty. In one such case, Mr. Tranquilli prosecuted Richard Poplawski, who was sentenced to death for the murders of Pittsburgh Police Officers Eric Kelly, Stephen Mayhle and Paul Sciullo on April 4, 2009.
Mr. Tranquilli joined the Allegheny County District Attorney’s Office in 1994, serving first in the General Trial Unit from 1994 to 1998, then in the Robbery Unit from 1998 to 2000. Mr. Tranquilli served as an original member of the Homicide Unit from its inception in 2000 until his promotion to Deputy District Attorney in 2005.
Mr. Tranquilli graduated cum laude from Allegheny College in Meadville with a Bachelor of Arts degree in History and Political Science in 1989, then earned his law degree from the University of Pittsburgh in 1992.