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On Thursday, Timothy Leininger, 27, was pronounced dead at UPMC Mercy, and Monty Crawford, 23, died at the jail.
The grand jury is looking into whether administrators and staff members knew of inappropriate relationships between teachers and students.
Hubert Wingate, 30, faces charges of homicide, arson and other crimes in the death of Andre Gray, 34.
Chief Cameron McLay has said he wants every Pittsburgh officer to eventually go through the program.
A 54-count indictment names 38 people, each charged with heroin distribution, weapons possession by convicted felons and money laundering.
Pittsburgh is among six cities that are part of a three-year federal program.
Temperatures in Pittsburgh were expected to descend into the mid-30s overnight before rebounding to a high of 70 on Saturday.
A new "Honors Escort" program will include draping an American flag on the gurney carrying a deceased veteran with escorts by its side.