
    Memo PARKER, Plaintiff-Appellant, v. Robert NISHIYAMA; Peter Hoyle; Thomas Allman; Mendocino County Sheriffs Office; County of Mendocino, Defendants-Appellees.
    No. 09-17831.
    United States Court of Appeals, Ninth Circuit.
    Argued and Submitted April 13, 2011.
    Filed June 21, 2011.
    Editte Dalya Lerman, Law Office of E.D. Lerman, Ukiah, CA, J. David Nick, San Francisco, CA, for Plaintiff-Appellant.
    Thomas A. Blake, Deputy Attorney General, John P. Devine, AGCA-Office of the California Attorney General, San Francisco, CA, Douglas Lawrence Losak, Counsel, Jeanine Bennett Nadel, Esquire, County Counsel, Ukiah, CA, Steven Mitchell, Tarik J. Naber, Geary, Shea, O’Donnell, Grattan & Mitchell, P.C., Santa Rosa, CA, for Defendants-Appellees.
    Before: FERNANDEZ and RAWLINSON, Circuit Judges, and WELLS, Senior District Judge.
    
    
      
       The Honorable Lesley Wells, Senior U.S. District Judge for the Northern District of Ohio, sitting by designation.
    
   MEMORANDUM

Appellant Memo Parker (Parker) challenges the district court’s dismissal of his Sixth Amendment and conspiracy claims because Parker failed to sufficiently allege that he was substantially prejudiced by an unlawful interrogation. Parker also asserts that the district court abused its discretion in denying leave to amend the complaint.

1. The district court properly dismissed Parker’s Sixth Amendment claims. Parker’s conelusory allegation that he “suffered prejudice or substantial detriment” failed to satisfy the requisite pleading standards. See Telesaurus VPC, LLC v. Power, 623 F.3d 998, 1003 (9th Cir.2010).

2. In his opposition to the motion to dismiss, Parker alleged that he was prejudiced by the unlawful interrogation because he was forced to accept a plea offer. The district court properly held that Parker’s untimely allegation could not cure the complaint’s defects. See Broam v. Bogan, 320 F.3d 1023, 1026 n. 2 (9th Cir.2003) (“In determining the propriety of a Rule 12(b)(6) dismissal, a court may not look beyond the complaint to a plaintiffs moving papers, such as a memorandum in opposition to a defendant’s motion to dismiss.”) (citation omitted) (emphasis in the original). In any event, Parker’s speculative allegation regarding the plea offer is insufficient, as it lacks the requisite facial plausibility. See Caviness v. Horizon Comm. Learning Ctr., Inc., 590 F.3d 806, 812 (9th Cir.2010).

3. Because Parker failed to sufficiently allege a Sixth Amendment violation, the district court properly dismissed Parker’s related conspiracy claim. See San Diego Police Officers’ Ass’n v. San Diego City Employees’ Retirement Sys., 568 F.3d 725, 740 (9th Cir.2009) (“[T]he absence of any actionable constitutional violation negates by definition the existence of a conspiracy to violate constitutional rights.”) (citation omitted).

4. The district court did not abuse its discretion in dismissing Parker’s claims without leave to amend, as “other facts consistent with the challenged pleading could not possibly cure the deficiency.” Abagninin v. AMVAC Chem. Corp., 545 F.3d 733, 742 (9th Cir.2008) (citation omitted). Parker’s counsel also informed the district court that there was nothing to be gained by further amendments. See Krainski v. Nev. ex rel. Bd. of Regents of Nev. Sys. of Higher Educ., 616 F.3d 963, 972 (9th Cir.2010) (“Here, [Parker] conceded that there were no new facts that [he] would include in [his] complaint to overcome its shortcomings. Under the circumstances ... the district court did not abuse its discretion in denying [Parker] leave to amend [his] complaint.”).

AFFIRMED. 
      
       This disposition is not appropriate for publication and is not precedent except as provided by 9 th Cir. R. 36-3.
     
      
      . Parker did not challenge in his opening brief the district court's rulings in favor of Thomas Allman, Mendocino County Sheriff’s Office, and the County of Mendocino. As a result, Parker has waived any challenges to those rulings. See Cook v. AVI Casino Enter., Inc., 548 F.3d 718, 726 n. 6 (9th Cir.2008).
     