A late-summer gathering on East Chestnut Street in Lancaster ended in murder. On September 5, 2015, 26-year-old Luis Yampi Santiago was at a house party when a dispute with another man escalated. Witnesses said the other man, identified as 30-year-old Jaime Alberto Santiago-Leon, produced a handgun and shot Santiago. Santiago was pronounced dead at the scene and Santiago-Leon fled.

Lancaster authorities quickly named Santiago-Leon the primary suspect and obtained a criminal homicide warrant. After a multi-state search, he was located in Early, Texas, and returned to Pennsylvania to face charges. The case concluded in 2017 when Santiago-Leon pleaded guilty to third-degree murder and received a 20 to 40 year prison term for Luis Santiago’s death.

If anyone at the East Chestnut Street gathering or with information about the events that night can help fill gaps in the timeline, please come forward.