opinion: HARRIS v. WASHINGTON et al.
  No. 70-5213.
  Decided November 16, 1971
  Per Curiam.
  On June 10, 1969, a bomb sent through the mail exploded in the residence of Ralph Burdick in Clark County, Washington. The explosion killed Burdick and the petitioner’s infant son, Mark Allen Harris, and seriously injured the petitioner’s estranged wife, Laila Violet Harris. The petitioner was tried in a state court for the murder of Ralph Burdick and was acquitted by a jury. He was immediately rearrested on informations charging the murder of Mark Allen Harris and the assault upon Laila Violet Harris. To these informations the petitioner entered pleas of former jeopardy and collateral estoppel, and moved to dismiss. The trial court denied the motion and struck the defenses.
  The state Court of Appeals granted a writ of prohibition on the grounds of collateral estoppel, finding that “the record demonstrates without question that the retrial of petitioner for assault and murder will require relitigation of the same ultimate fact” determined adversely to the State in the previous trial — i. e., whether it was the petitioner who had mailed the bomb. 2 Wash. App. 272, 291-292, 469 P. 2d 937, 948. The Supreme Court of Washington agreed that the same ultimate issue was involved in both prosecutions, but nevertheless reversed the Court of Appeals and denied the writ of prohibition. The court noted that a ruling on the admissibility of evidence during the murder trial had resulted in the exclusion, on grounds having “no bearing on the quality of the evidence,” of a letter allegedly written by the petitioner and containing threats against the lives of Mr. Burdick and Mrs. Harris. 78 Wash. 2d 894, 901, 480 P. 2d 484, 487-488. Because of its view that this evidence would clearly be admissible in the second trial, the court held that the issue of identity had not been “fully litigated” in the previous trial, and that the doctrine of collateral estoppel did not bar a subsequent trial in which litigation of the issue will be “complete.”
  Since the state courts have finally rejected a claim that the Constitution forbids a second trial of the petitioner, a claim separate and apart from the question whether the petitioner may constitutionally be convicted of the crimes with which he is charged, our jurisdiction is properly invoked under 28 U. S. C. § 1257. See Mercantile National Bank v. Langdeau, 371 U. S. 555, 558.
  In Ashe v. Swenson, 397 U. S. 436, we held that collateral estoppel in criminal trials is an integral part of the protection against double jeopardy guaranteed by the Fifth and Fourteenth Amendments. See Benton v. Maryland, 395 U. S. 784. We said that collateral estop-pel “means simply that when an issue of ultimate fact has once been determined by a valid and final judgment, that issue cannot again be litigated between the same parties in any future lawsuit.” 397 U. S., at 443. The State concedes that the ultimate issue of identity was decided by the jury in the first trial. That being so, the constitutional guarantee applies, irrespective of whether the jury considered all relevant evidence, and irrespective of the good faith of the State in bringing successive prosecutions.
  Since Ashe v. Swenson, supra, squarely controls this case, the motion for leave to proceed in forma pauperis is granted, the petition for a writ of certiorari is granted, and the judgment is
  Reversed.
  Mr. Justice Douglas, Mr. Justice Brennan, and Mr. Justice Marshall would grant the petition and reverse the judgment both for the reasons stated in the per curiam opinion and for the reasons stated in Mr. Justice Brennan’s concurring opinion in Ashe v. Swenson, 397 U. S. 436, 448.