In April 2015, Rodney Franck intervened to stop a brutal assault on 54-year-old Christopher Brewster, who was left in a coma and died in June 2015. Subsequently, the perpetrator of the assault, Spencer Pell, bragged about the attack to more than 10 individuals before giving a voluntary confession to police.
Despite overwhelming evidence that Pell was the assailant, Franck was subsequently charged with murder. His trial is set for August 2018.
For more details see http://www.usobserver.com/prosecutor-disregards-confession-of-killer/