Moise's assassination plunged the Caribbean nation, already plagued by hunger and gang violence, further into chaos, and triggered a hunt for the masterminds across the Americas.
Wearing a black dress and sling following the injuries she suffered during the attack, Martine Moise told Reuters in a room flanked by bodyguards on Monday that while Haitian authorities had made some advances, she feared progress had slowed.
"I feel that the process is... stalling a little," she said. "The people that did this are still out there, and I don't know if their name will ever be out. Every country that can help, please help."
Nearly two months after the July 7 assassination of her husband, key aspects of the murder remain shrouded in mystery.
Haitian police have arrested more than three dozen suspects, including 18 Colombian mercenaries, an obscure Haitian-American doctor they say aspired to be president, and the head of Moise's security team.