The opinion of the court was delivered by: Colleen Kollar-kotelly United States District Judge
Currently pending before this Court are Defendant Unity Health Care, Inc.'s ("Unity")  Motion to Dismiss and to Substitute Defendant, and Plaintiff's  Motion for Leave to File an Amended Complaint. Upon consideration of the parties' motions and responsive briefing, as well as the applicable case law and statutory authority, the Court concludes that it lacks subject matter jurisdiction over Plaintiff's claims against Unity. Accordingly, for the reasons below, the Court shall GRANT Unity's Motion to Dismiss as to Plaintiff's claims against Unity pursuant to Rule 12(b)(1), and shall DENY Plaintiff's Motion for Leave to File an Amended Complaint. In addition, because the Court lacks subject matter jurisdiction over Plaintiff's remaining claims, the Court shall REMAND this case back to the Superior Court for the District of Columbia.
The above-captioned case was originally filed in the Superior Court for the District of Columbia on April 7, 2008, by Plaintiff, Pasty Edwards, both on her individual behalf as mother of the deceased Alicia Edwards and as representative of the Estate of Alicia Edwards. See Notice of Removal, Docket No. , Ex. A (Complaint) (hereinafter, "Compl."). Plaintiff's claims arise from the suicide of her daughter, Alicia Edwards, while Ms. Edwards was being held at the District of Columbia Jail. See generally id. Plaintiff names as Defendants Unity and the District of Columbia (the "District," together with Unity, "Defendants")*fn1 and alleges that Defendants were negligent in providing mental health care to Ms. Edwards and in ensuring that Ms. Edwards was not a danger to herself. Id. ¶ 15. Plaintiff also alleges that Defendants failed to adequately provide a medical response upon discovering Ms. Edwards in the immediate moments after her suicide. Id. ¶ 13. Based on these allegations, Count One of Plaintiff's Complaint sets forth a survival cause of action, and Count Two sets forth a wrongful death cause of action. See id. ¶¶ 6-26.
On October 10, 2008, Unity removed the instant case to this Court, see Notice of Removal at 1-2, and shortly thereafter filed a Motion to Dismiss and to Substitute Defendant, see Def.'s MTD. In its filings, Unity explains that it is a grantee of the Department of Health and Human Services ("HHS") and that, by operation of statute, it has been deemed to be an employee of the United States for purposes of liability under the Federal Tort Claims Act ("FTCA"), 28 U.S.C. §§ 2671 et. seq. Id. at 2. Because Plaintiff asserts tort claims against Unity seeking monetary damages and because Unity is deemed an employee of the United States for purposes of the FTCA, Unity states that Plaintiff's claims are cognizable only under the FTCA. See generally Notice of Removal; Def.'s MTD at 2-5. However, because Plaintiff did not exhaust her administrative remedies under the FTCA prior to commencing the instant litigation, Unity argues that Plaintiff's claims must be dismissed for a lack of subject matter jurisdiction pursuant to Rule 12(b)(1). Id. at 3-5. In addition, because the United States (and not Unity) is the only proper defendant in an action under the FTCA, Unity moves to substitute the United States as Defendant in this action. Id. at 5-6
Significantly, Plaintiff filed a response indicating that she does not oppose Unity's motion. Pl.'s Resp. to Fed. Def.'s MTD, Docket No. . Plaintiff explains in that response that she had not been aware prior to filing the Complaint in this matter on April 7, 2008, that Unity is a grantee of HHS and therefore had not filed an administrative tort claim as required under the FTCA. See id. Plaintiff advises the Court, however, that soon after filing the Complaint, she became aware that Unity is a grantee of HHS and therefore filed the requisite claim with HHS on August 8, 2008. Id. Plaintiff, by concession, therefore acknowledges that her claims against Unity are cognizable only under the FTCA, that she did not exhaust her administrative remedies prior to filing suit, and that the United States is the only proper defendant in this case. See id. Accordingly, Plaintiff indicates in her response to Unity's motion that she does not oppose dismissal of her Complaint as to Unity, so long as the dismissal is without prejudice. See id.
However, after Plaintiff filed her response indicating consent to dismiss-but before the Court had an opportunity to rule on that unopposed motion-Plaintiff filed a  Motion for Leave to File an Amended Complaint. Without acknowledging her previous filing agreeing to dismissal of her claims against Unity, Plaintiff now asserts in her Motion for Leave that she should be permitted to amend her Complaint because she has now successfully exhausted her administrative remedies. Mot. for Leave to File Am. Compl. at 1-2. Unity filed an Opposition to Plaintiff's Motion for Leave, arguing that Plaintiff's failure to exhaust her administrative remedies prior to commencement of this action denies this Court subject matter jurisdiction over Plaintiff's FTCA claims and that this jurisdictional defect cannot be cured by filing an amended complaint. Def.'s Opp'n at 2-4. Plaintiff declined to file a reply in support of her motion seeking leave to amend her Complaint and therefore has not addressed Unity's argument that the subject matter jurisdiction defect in this case may not be remedied by an amending Plaintiff's complaint.*fn2 The instant motions are now fully briefed and ripe for decision.
A court must dismiss a case when it lacks subject matter jurisdiction pursuant to Rule 12(b)(1). In so doing, the Court may "consider the complaint supplemented by undisputed facts evidenced in the record, or the complaint supplemented by undisputed facts plus the court's resolution of disputed facts." Coalition for Underground Expansion v. Mineta, 333 F.3d 193, 198 (D.C. Cir. 2003) (citations omitted); see also Jerome Stevens Pharm., Inc. v. Food & Drug Admin., 402 F.3d 1249, 1253 (D.C. Cir. 2005) ("[T]he district court may consider materials outside the pleadings in deciding whether to grant a motion to dismiss for lack of jurisdiction."); Vanover v. Hantman, 77 F. Supp. 2d 91, 98 (D.D.C. 1999), aff'd, 38 F. App'x 4 (D.C. Cir. 2002) ("[W]here a document is referred to in the complaint and is central to plaintiff's claim, such a document attached to the motion papers may be considered without converting the motion to one for summary judgment.") (citing Greenberg v. The Life Ins. Co. of Va., 177 F.3d 507, 514 (6th Cir. 1999)). "At the motion to dismiss stage, counseled complaints, as well as pro se complaints, are to be construed with sufficient liberality to afford all possible inferences favorable to the pleader on allegations of fact." Settles v. U.S. Parole Comm'n,429 F.3d 1098, 1106 (D.C. Cir. 2005). In spite of the favorable inferences that a plaintiff receives on a motion to dismiss, it remains the plaintiff's burden to prove subject matter jurisdiction by a preponderance of the evidence. Am. Farm Bureau v. Environmental Prot. Agency, 121 F. Supp. 2d 84, 90 (D.D.C. 2000).
As explained above, Plaintiff seeks to bring a tort suit against Unity and the District of Columbia seeking monetary damages arising from the death of Ms. Edwards while being held at the District of Columbia Jail. As is relevant to Plaintiff's tort claims against Unity, the parties agree that the sole basis for her claims is the FTCA. See supra p. 3. Generally, the FTCA provides that the "United States shall be liable [for tort claims] in the same manner and to the same extent as a private individual under like circumstances." 28 U.S.C. § 2674(a). "The FTCA operates as a limited waiver of sovereign immunity, rendering the United States amenable to suit for certain, but not all, tort claims." Rashad v. D.C. Central Detention Facility, 570 F. Supp. 2d 20, 23 (D.D.C. 2008) (citing Richards v. United States, 369 U.S. 1, 6 (1962)). "Absent a waiver, sovereign immunity shields the Federal Government and its agencies from suit." Fed. Deposit Ins. Corp. v. Meyer, 510 U.S. 471, 475 (1994) (citations omitted).
In order to bring suit under the FTCA, a claimant must first exhaust his or her administrative remedies. Specifically, section 2675(a) provides that:
An action shall not be instituted upon a claim against the United States for money damages for injury or . . . or personal injury or death caused by the negligent or wrongful act or omission of any employee of the Government while acting within the scope of his office or employment, unless the claimant shall have first presented the claim to the appropriate Federal agency and his claim shall have been finally denied by the agency in writing and sent by certified or registered mail. The failure of an agency to make final disposition of a claim within six months after it is filed shall, at the option of the claimant any time thereafter, be deemed a final denial of the claim for purposes of this section.
28 U.S.C. § 2675(a). The plain language of the FTCA therefore bars a plaintiff from filing suit before he or she has exhausted these administrative remedies. McNeil v. United States, 508 U.S. 106, 112 (1993) ("The most natural reading of the statute indicates that Congress intended to require complete exhaustion of Executive remedies before invocation of the judicial process.") (emphasis added). Here, there is no dispute that Plaintiff did not administratively exhaust her remedies under the FTCA prior to filing her ...