Aftеr two jury trials before the U.S. Magistrate for the Western District of Washington, Lance H. Mortensen was convicted and sentenced for willful failure to file a tax return. Mortensen appeals the *949 district сourt order affirming his conviction and sentence. He presents two issues on appeal: (1) whether he should have been allowed to withdraw his consent to trial before the magistrate after his first trial ended in a mistrial, and (2) whether the magistrate erred in admitting into evidence on retrial the testimony Mortensen gave during the first trial. We hold that a defendant is entitled to withdraw in a timely manner his consent to trial before a magistrate. Because we find that Mortensen’s withdrawal motion was not timely and that his evidence claim is meritless, we affirm the district court order.
FACTS
In 1985, Mortensen was charged with four cоunts of willful failure to file a tax return under 26 U.S.C. § 7203. He consented in writing to trial before a magistrate as provided by 18 U.S.C. § 3401(b). His first jury trial ended in a mistrial on December 7, 1985, after the jury failed to reach a unanimous verdict. The magistrate scheduled a retrial. On the morning of the retrial, April 21, 1986, Mortensen moved to withdraw his consent to trial before the magistrate. The magistrate transferred the proceedings to the district court for a ruling on the motion. The district judge denied the motion and returned the case to the magistrate for trial. Mortensen then made an emergency interlocutory appeal to this court, which was denied. On April 22, 1986, Mortensen’s second jury trial began and ended some time later in his conviction. On July 30, 1986, the magistrate sentenced Mortensen to one year of imprisonment and iriiposed a $4,000 finе. Mortensen appealed immediately to this court. We returned the appeal to its proper forum, the district court. On June 25, 1987, the district court affirmed the conviction and sentence. Mortensen now appeals this order.
STANDARD OF REVIEW
Because this appeal involves questions of federal law alone, we conduct a
de novo
review of the issues presented.
In re Bialac,
JURISDICTION
Before discussing the merits of Mortensen’s contentions, a jurisdictional issue requires some attention. We note that Mortensen failed to file his notice of appeal within the 10-day period established by Rule 4(b), Fed.R.App.P. Rule 4(b) requires that “[i]n a criminal case the notice of appeal by a defendant shall be filed in the district court within 10 days after the entry of the judgment or order appealed from____ A judgment or order is entered ... when it is entered in the сriminal docket.” Compliance with Rule 4(b) is, of course, both mandatory and jurisdictional.
United States v. Eccles,
In a criminal case, failure to file a notice of appeal within Rule 4(b)’s 10-day period is not necessarily а fatal mistake. Rule 4(b) also provides
Upon a showing of excusable neglect the district court may, before or after the time has expired, with or without motion and notice, extend the time fоr filing a notice of appeal for a period not to exceed 30 days from the expiration of the time otherwise prescribed by this subdivision.
When a defendant in a criminal case has filеd a notice of appeal after the 10-day period, but within the 30-day period in which the district court could have extended the time for filing, this court will remand to the district court to allow the appellant to make a showing of excusable neglect even though the defendant did not file a motion for extension within the 30-day period. If a proper showing of excusable neglect is made, the district court may rule that an extension of time, not to exceed 30 days, is appropriate. Upon a ruling by the district court that such an extension of time is appropriate, a notice of appeal filed within that extension period is *950 deemed timely. United States v. Stolarz, 547 F.2d 108, 111-12 (9th Cir.1976). We retain jurisdiction pending the district court’s determination on remand and postpone ruling on whether the appeal was timely. Id. аt 112. In this case, we discovered that the filing of the notice of appeal occurred after the 10-day period. On November 13, 1987, a prior panel of this court ordered a remand to thе district court for an extension ruling. Mortensen moved on December 9, 1987, for an extension of 30 days on grounds of excusable neglect. The district court found excusable neglect and granted the mоtion on December 23, 1987. Consequently, we hold that the appeal was timely under Rule 4(b). We thus have jurisdiction pursuant to 28 U.S.C. § 1291.
DISCUSSION
1. Withdrawal of Consent
Mortensen claims that the mistrial ended the vitality of his consent to trial before а magistrate. He contends that the magistrate and district judge improperly denied him the opportunity to withdraw.
We hold that consent to trial before a magistrate is not automatically can-celled by a mistrial but continues in force until it is revoked or withdrawn in a timely fashion. Although our circuit has not directly addressed this issue, the Sixth Circuit has confronted the withdrawal question. In
United States v. Lee,
The continuity of consent, however, is only a presumption. Although jurisdiction might remain unbroken, consent can be withdrawn by the defendant if done in a timely manner. Waiver of the right to trial before an Article III judge invоlves important constitutional rights.
See United States v. Dobey,
We requirе only that the notice of withdrawal be timely. Timeliness is not a concept subject to precise quantification. The circumstances of each individual case determine its contours. In аccord with a well-established tradition, we hold that a withdrawal motion is timely when granting the motion would not unduly interfere with or delay the proceedings.
Cf. Arnold v. United States,
Mortensen’s motion to withdraw clearly failed to satisfy the timeliness requirement. He waited to file the motion until the morning on which the retrial was scheduled to begin, with a jury panel called and waiting in the courthouse. Behavior of this sort seems intentionally calculated to cause delay and interference. Prior to the retrial date, Mortensen gave every indication that he anticipated retrial before the magistrate. Mortensеn allowed without objection the scheduling of a new hearing before the magistrate; he set a date for the submission of pretrial motions to the magistrate; he submitted a material witness warrant that explicitly referred to retrial before the magistrate; he filed with the magistrate a motion to dismiss that did not express a change in his consent status; he sought and received a continuance from the magistrate. These actions demonstrate that Mortensen continued to consent to trial before the magistrate up to the very morning the trial was to begin. In light of these factors, we conclude that Morten-sen’s withdrawal motion was untimely and therefore properly denied.
2. Admission of Testimony
Mortensen argues that the magistrate improperly admitted into evidence on retrial Mortensen’s testimony during the first trial. Citing
Harrison v. United States,
Mortensen’s reliance on
Harrison
is misplaced. A defendant’s testimony in a prior trial is normally аdmissible in subsequent proceedings.
Harrison
states that an exception to this rule arises when the defendant’s prior testimony was compelled by the need to counter evidence that was illegally оbtained and improperly admitted.
Harrison,
AFFIRMED.
