In the days before research with live guinea-pig proved that facedown restraints were deadly, 17 year old Roxanna Gray lost her life during these trials.
Unlike many cases from that period this tragedy was investigated and a staff member was sentenced to a 4 year prison term. It was later suspended to a one year period of probation.
Victims in 1980s, Fornits Wiki datasheet
Probation for death, The Rochester Sentinel - April 4, 1990