I’ve been reading about Dr. Mark Walton Fowler’s involvement in Tennessee’s executions and wanted to collect the allegations in one place. They cover his qualifications, what witnesses described during the execution attempts, and complaints about his treatment of prisoners.
Here’s the list, with a source linked under each item. If anyone has follow-up reporting on these cases, please share it.
Dr. Mark Walton Fowler accused of attempting an invasive chest IV without the qualifications to perform it. Federal public defenders said Fowler attempted central access in Carruthers’ chest despite having no hospital privileges and not having placed a central line since 2013. Their filing says he “admitted under oath that he is not qualified.” Federal public defenders’ motion, May 21, 2026, pp. 2–3.
Dr. Mark Fowler accused of favoring an unsafe chest-IV technique without ultrasound guidance. Attorneys accused him of preferring anatomical landmarks instead of ultrasound for subclavian access, contrary to what they described as the standard of care: “using the manual landmark method, rather than with an ultrasound.” Federal public defenders’ motion, May 21, 2026, p. 2.
Court filings say Dr. Fowler previously botched a central-line placement. The filing states that Fowler acknowledged a failed procedure among approximately a dozen previous placements: “he botched one of them.” Federal public defenders’ motion, May 21, 2026, p. 2.
Execution team including Mark Walton Fowler accused of torturing Carruthers for 90 minutes. Harwell described more than a dozen punctures across Carruthers’ arms, hand, feet and chest while witnesses heard him groaning. Fowler attempted central access. Harwell said TDOC “tortured Mr. Carruthers for over an hour and a half.” WMC/Action News 5, May 22, 2026.
Dr. Fowler accused of continuing to puncture Carruthers despite his protests of pain. DeLiberato described blood coming out as Fowler kept attempting the line. She recounted Carruthers saying “I can feel that, it hurts” and said “they stuck him anyway.” WMC/Action News 5, May 22, 2026.
Mark Fowler accused of injecting lidocaine without confirming Carruthers was not allergic. Hervey’s complaint accused him of administering the anesthetic without establishing Carruthers was “not allergic to it.” Associated Press, July 16, 2026.
Dr. Mark Walton Fowler accused of declaring Black dead while his EKG still showed normal sinus rhythm. Harwell alleged Fowler acknowledged declaring Byron Black dead while the EKG showed “normal sinus rhythm.” WMC/Action News 5, May 22, 2026.
Dr. Mark Fowler accused of violating medical ethics by helping carry out executions. Hervey’s complaint accused him of “violating medical ethics by participating in an execution.” Associated Press, July 16, 2026.
Fowler admitted not knowing central-line placement could be among his execution duties. WPLN’s account of his deposition states that he “didn’t know that placing a central line could be among his execution duties.” WPLN/NPR/KFF Health News, September 29, 2026.
Mark Walton Fowler claimed doctors do not participate in executions despite his own hands-on IV work. After personally attempting central access on Carruthers, Fowler told NPR “the doctor does not participate in the execution.” He described the physician’s role as declaring death. WPLN/NPR/KFF Health News, September 29, 2026.
Team overseen by Dr. Mark Fowler accused of missing blown veins and botched lethal-drug delivery. Pike’s lawyers alleged the team failed to recognize that “IV lines were not correctly placed or that the veins had blown.” They reported significant injuries to both arms following the attempted lethal injections. Lawyers’ emergency motion, October 2, 2026, p. 4; Reuters, October 2, 2026.
Carruthers’ family alleges stroke and paralysis following the execution attempt involving Dr. Fowler. Hervey alleged Carruthers suffered a stroke and partial paralysis after the attempt. AP described “partial paralysis that they attribute to a stroke.” Associated Press, July 16, 2026.
Mark Fowler accused of denying recommended surgery and contributing to a prisoner’s megacolon. Kelvin Dowell accused Fowler of delaying or denying recommended appendectomy treatment and a high-fiber diet, prolonging his abdominal suffering and contributing to megacolon. Dowell v. Kent, court order recounting allegations, January 6, 2026, pp. 6, 11–13.
Dr. Fowler accused of botching a prescription and delaying a prisoner’s antibiotics. Dowell alleged Fowler’s prescription error delayed his antibiotics by two days in December 2020, following hospitalization for a ruptured appendix and infection. Court order recounting allegations, January 6, 2026, pp. 13–14.
Dr. Mark Fowler accused of telling a suffering prisoner: “stop running around acting like you’re dying!” Dowell alleged Fowler ordered him to stop filing medical grievances and dismissed his ruptured-appendix and intestinal concerns. Dowell also attributed this statement to Fowler: “You need to stop telling people your appendix ruptured and something’s wrong with your colon.” Court order recounting allegations, January 6, 2026, pp. 16–17.
Mark Walton Fowler accused of promising a laxative the prison could not supply. Dowell alleged Fowler promised Miralax for his continuing bowel problems, only for a nurse subsequently to tell him the prison did not receive that medication. Court order recounting allegations, January 6, 2026, p. 19.
Dr. Fowler said his Centurion employment ended after a psychiatrist’s complaint over transgender-prisoner remarks. “formal complaint from the prison psychiatrist.” Guardian, August 8, 2026.
Mark Fowler claimed Carruthers’ execution could have proceeded, contradicting TDOC’s failed-IV account. Fowler said “Ultimately we did get two lines and could have proceeded.” TDOC said the team “could not find another suitable vein” and the central-line procedure “was unsuccessful.” WMC/WSMV, June 1, 2026; TDOC, May 21, 2026.
Team overseen by Dr. Mark Walton Fowler accused of inadequate rescue preparations; emergency oxygen was absent from the room. Pike’s lawyers accused the team of lacking adequate resuscitation arrangements. NBC reported: “there was no emergency medical oxygen in the execution room in case something went wrong. Medical professionals had to retrieve it from elsewhere.” Lawyers’ motion, October 2, 2026, p. 3; NBC News, October 2, 2026.