The U.S. Marshals Service, in coordination with Avondale Police, is actively seeking Matthew Christopher Flores Semyonov, a suspect wanted in connection with the deaths of his parents, Hector and Larissa Flores. The couple was identified by authorities on August 11, 2026, after their decomposing bodies were discovered buried in the backyard of a home in Litchfield Park, Arizona. The investigation began on August 4, when officers conducted a welfare check at a residence near Litchfield and Indian School roads. During this initial visit, police found signs of foul play inside the home, including a large amount of blood. Subsequent searches revealed the two victims buried in the backyard. The Maricopa County Office of the Medical Examiner has not yet released the manner or primary cause of death for Hector and Larissa Flores. Avondale Police identified Matthew Flores Semyonov as a suspect following a search of the family home. A federal arrest warrant has been obtained, alleging that Flores Semyonov fled the country to avoid prosecution. He is wanted on suspicion of first-degree murder, domestic violence, and abandonment or concealment of a dead body. The U.S. Marshals Service initiated an international search for the suspect after Avondale Police requested federal assistance on August 7. A photo of Flores Semyonov, taken on August 3, 2026, is available in the wanted notice. Authorities urge anyone with information regarding the suspect's location to contact the U.S. Marshals' 24-hour tip line at 1-877-WANTED2 or submit a tip anonymously through the agency's Tips App or website at www.usmarshals.gov/tips. This remains a developing story as the investigation continues.