Judge Throws Out Remaining Gun Charge Against Sean Ellis "This whole case is a very sad chapter in the history of the criminal justice system. Thankfully, this chapter seems to be nearing its conclusion," Superior Court Justice Robert Ullman said Tuesday Published May 4, 2021 • Updated on May 4, 2021 at 10:46 pm NBC Universal, Inc. A judge Tuesday threw out the remaining gun charge for a man who spent more than 20 years in prison for the killing of a police officer before his conviction was overturned in 2015. In a brief hearing, Superior Court Justice Robert Ullman allowed Sean Ellis' motion for a new trial on the gun conviction remaining on his record from his wrongful conviction for the 1993 murder of Boston Police Detective John Mulligan.