James Dennis v. City of Philadelphia, 19 F.4th 279

Background:

Dennis was convicted in 1991 of robbery and first-degree murder and sentenced to death; his conviction was vacated on habeas in 2013 for withheld impeachment evidence and the en banc Third Circuit affirmed in 2016.
On remand Dennis pleaded nolo contendere to reduced charges for time served and was released, then sued two Philadelphia detectives, related officers, and the City under 42 U.S.C. § 1983 alleging fabrication of evidence, deliberate deception, conspiracy, failure to intervene, supervisory and municipal liability.
Core allegations: detectives concealed exculpatory/impeachment material (eyewitness statements and a time-stamped welfare receipt), fabricated/cloaked physical evidence (clothing), and coerced a witness (Charles Thompson) to give false testimony.
Defendants moved to dismiss under Rule 12(b)(6), arguing qualified immunity and that the claims are Heck-barred; the District Court denied the detectives’ qualified-immunity defense and dismissed the municipal claim against the City.
The detectives appealed interlocutorily; the Third Circuit accepted review only of the qualified-immunity ruling and declined to exercise jurisdiction over the Heck issue.

Issues:

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether detectives are entitled to qualified immunity for fabrication-of-evidence claim	Dennis: detectives knowingly fabricated/used false evidence and thus violated due process (Fourteenth Amendment)	Detectives: no clearly established law in 1992 placing them on notice that fabricating evidence violated due process in this context	Denied qualified immunity; precedent made fabrication by law enforcement a clearly established due-process violation in 1992
Whether detectives are entitled to qualified immunity for deliberate deception (concealment/false testimony)	Dennis: detectives deliberately deceived court/jury by concealing impeachment/exculpatory evidence and allowing false testimony	Detectives: claims effectively Brady claims and police lacked clearly established obligation in 1992 to foresee prosecutors’ nondisclosure; thus qualified immunity applies	Denied qualified immunity; deliberate deception that produces false trial testimony or conceals evidence is a clearly established due-process violation
Whether the claims must be brought under the Fourth Amendment rather than the Fourteenth	Dennis: pled Fourteenth Amendment due-process claims for fabrication and deliberate deception	Detectives: these claims are Fourth Amendment claims and defendants preserved this argument	Waived by defendants on appeal; Third Circuit declined to reach the merits of this argument
Whether Heck v. Humphrey bars Dennis’s claims and if that ruling is reviewable here	Dennis: conviction was vacated; his claims do not necessarily imply invalidity of remaining sentence	Detectives: Heck bars suit because success would imply invalidity of conviction/sentence	Third Circuit: no interlocutory jurisdiction to decide Heck here; appeal of that issue dismissed without prejudice

Key Cases Cited

Halsey v. Pfeiffer, 750 F.3d 273 (3d Cir. 2014) (recognizing fabrication-of-evidence claim against police violates due process)
Mooney v. Holohan, 294 U.S. 103 (1935) (due process violated where conviction obtained by presentation of known perjured testimony)
Pyle v. Kansas, 317 U.S. 213 (1942) (conviction obtained through perjured testimony and suppression of favorable evidence violates due process)
Miller v. Pate, 386 U.S. 1 (1967) (conviction obtained by knowingly false evidence unconstitutional)
Heck v. Humphrey, 512 U.S. 477 (1994) (limits civil suits that would necessarily imply invalidity of conviction)
Ashcroft v. Iqbal, 556 U.S. 662 (2009) (qualified-immunity interlocutory appeals may be reviewable under collateral-order doctrine)
Harlow v. Fitzgerald, 457 U.S. 800 (1982) (standard for qualified immunity)
Kyles v. Whitley, 514 U.S. 419 (1995) (prosecutor’s Brady obligations and relation to evidence in police hands)
Curran v. Delaware, 259 F.2d 707 (3d Cir. 1958) (police testimony known to be false can violate due process)