One Dead, One Injured After Physical Altercation in West Mifflin
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Victim Identified: The deceased has been identified as Mario Alejandro Perez Santos, who was found inside a trailer on Thompson Run Road in West Mifflin, according to law enforcement.CBS News
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Incident Overview: Police responded to a call just before 11 p.m. Saturday evening. Inside the trailer, they found Perez Santos with significant head trauma and multiple puncture wounds. A second individual, 20-year-old Andy‑Steven Nimajuan‑Sitan, was injured and taken to a hospital. His condition was reported as stable.WTAECBS News
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What Happened: According to the criminal complaint, the two were drinking when a physical altercation broke out. The fight escalated to the use of weapons—a knife and a baseball bat. Nimajuan‑Sitan claimed that Perez Santos initiated the confrontation by attacking him with a knife.CBS News
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Charges and Investigation: Nimajuan‑Sitan has been charged with criminal homicide and is currently held in the Allegheny County Jail. The Allegheny County District Attorney’s Office and local police are actively investigating the circumstances.CBS News
Summary Table
| Detail | Description |
|---|---|
| Deceased | Mario Alejandro Perez Santos |
| Injured Party | Andy‑Steven Nimajuan‑Sitan, stable |
| Location | Thompson Run Road, West Mifflin, PA |
| Weapons Involved | Knife and baseball bat |
| Charge | Criminal homicide (against Nimajuan‑Sitan) |
| Investigation Status | Ongoing by Allegheny County police and DA’s office |
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