Background
In 2023, a jury found Mamadou Aliou Diallo guilty of two counts of murder, aggravated arson, tampering with evidence, and abuse of a corpse in the death of his wife, Fatoumata Diallo. Evidence at trial showed that Fatoumata died from ligature strangulation and thermal burns, with a knotted cord around her neck and lighter fluid nearby. Ring doorbell and neighbor camera footage contradicted Diallo’s claims about the timeline of events, showing him calmly removing children from the home before calling 911.
After his convictions were affirmed on direct appeal, Diallo sought postconviction relief centered on two issues: alleged recordings from his Blink home security cameras that he claimed would have shown another person entering the home, and the trial testimony of a retired fire battalion chief. The trial court denied the petition without a hearing.
The Court’s Holding
The Tenth District affirmed the denial. On the Blink camera issue, the court found that Diallo failed to present substantive evidence outside the record that the recordings actually existed or were withheld by the state. His own affidavit was self-serving and insufficient under R.C. 2953.21, which requires a petitioner to submit evidentiary documents containing sufficient operative facts to demonstrate a constitutional violation. The court noted that a forensic detective had examined Diallo’s devices and found the Blink app had been deleted before the incident.
Regarding the battalion chief’s testimony, the court found that any alleged deficiency was apparent from the trial record and could have been — and in part was — raised on direct appeal. Under res judicata principles codified in R.C. 2953.21, issues that were or could have been raised on direct appeal cannot be relitigated through postconviction proceedings.
Key Takeaways
- A postconviction petitioner must present evidence outside the trial record containing sufficient operative facts; self-serving affidavits alone are insufficient to warrant a hearing under R.C. 2953.21.
- Claims that could have been raised on direct appeal are barred by res judicata in postconviction proceedings, even if framed differently.
- The deletion of security camera apps before an incident may undermine claims that exculpatory footage existed and was withheld.
Why It Matters
This case is instructive for criminal defense attorneys preparing postconviction petitions in Ohio. The decision underscores the high evidentiary bar for obtaining a hearing: conclusory assertions about missing evidence, even technologically sophisticated evidence like home security recordings, must be supported by concrete proof. It also illustrates the increasingly important role of smart-home device data in criminal cases and the forensic examination of digital evidence.