How have courts treated the use of inflammatory and/or inflammatory statements by a prosecutor at a murder trial?

¹⁹ In Darden,the prosecutor suggested that the death penalty would be the only guarantee that the defendant would not commit another heinous crime in the future, that the defendant was an "animal," that the defendant should not be let out of his prison cell without a "leash," and that the prosecutor wished the defendant's face had been "blown off" by a shotgun. See Darden v. Wainwright,477 U.S. 168, 17980, nn. 912, 106 S.Ct. 2464, 91 L.Ed.2d 144 (1986). These inflammatory statements, although clearly constituting prosecutorial misconduct, did not so irretrievably "infect" the trial with unfairness so as to violate due process.