Mario Alejandro Perez Santos Obituary, Death – Authorities in Allegheny County are investigating a fatal incident that occurred Saturday night inside a West Mifflin home, leaving one man dead and another injured. Police responded to a welfare check at a residence on Thompson Run Road shortly before 11 p.m., where they discovered a violent scene.
Upon arrival, officers found 20-year-old Andy-Steven Nimajuan-Sitan with cuts on both hands, while another man had suffered multiple injuries and was pronounced dead at the scene. The deceased was later identified by the medical examiner as Mario Alejandro Perez Santos. Nimajuan-Sitan was transported to a local hospital for treatment of his injuries.
According to a criminal complaint, Nimajuan-Sitan later spoke with authorities and explained that he and Perez Santos had been living together and had spent the day drinking. An argument reportedly ensued between the two, which escalated when Perez Santos allegedly produced a knife and attacked Nimajuan-Sitan. The confrontation resulted in Nimajuan-Sitan sustaining lacerations and Perez Santos suffering fatal injuries.
Following the investigation and consultation with the district attorney’s office, Nimajuan-Sitan was charged with criminal homicide in connection with Perez Santos’s death. He has been taken into custody and is being held at the Allegheny County Jail pending his preliminary arraignment.
Police emphasized that there is no ongoing threat to the public and that all parties involved have been accounted for. Investigators continue to examine the circumstances surrounding the altercation to better understand the events leading up to the fatal incident.
Officials have not disclosed further details regarding the argument or any potential motives, but the ongoing investigation may provide additional insights into the factors that contributed to the deadly confrontation. Authorities are focused on ensuring a thorough and accurate reconstruction of the events to support the legal process.
The tragic incident underscores the dangers of domestic disputes escalating into violence. Law enforcement agencies often stress the importance of conflict resolution and intervention in situations where alcohol, weapons, or heated arguments are involved. Community members are reminded that seeking help in tense domestic situations can prevent tragedies.
Nimajuan-Sitan’s arrest and the charges filed against him mark a significant development in the case, though the legal process is still in its early stages. Further updates are expected as police and prosecutors continue their investigation, including potential additional charges or legal proceedings related to the incident.
As authorities work to piece together the events of that night, the West Mifflin community is grappling with the sudden loss of life and the violent circumstances surrounding it. Counseling and support services are often made available in the aftermath of such events to help neighbors and others affected by the tragedy cope with the emotional impact.
The case remains under active investigation, and officials have asked anyone with information about the incident to come forward to assist with law enforcement efforts. Public safety continues to be a priority as the community seeks answers and justice following this deadly altercation.
