Police in Pennsylvania have charged a man with homicide after authorities found a body with multiple stab wounds along railroad tracks in Scott Township Thursday evening.

Police responded at 5:54 p.m. Thursday to a report of an "unresponsive" man near the tracks, about 10 miles west of Pittsburgh, near the location of a homeless encampment. 

First responders pronounced the man, Joseph Williams, dead at around 6 p.m., WPXI reported. 

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Allegheny County police and Scott Township Police collaborated on an investigation that identified Vendell Nasir III, 28, as the prime suspect, police said in a statement. 

Vendell Nasir III, 28, is accused of killing 70-year-old Joseph Williams of Carnegie by beating and apparently attacking him with a knife, according to a criminal complaint. Nasir is charged with homicide and tampering with or fabricating evidence.

Vendell Nasir III, 28, is accused of killing 70-year-old Joseph Williams of Carnegie by beating and apparently attacking him with a knife, according to a criminal complaint. Nasir is charged with homicide and tampering with or fabricating evidence. (Allegheny County Jail)

Nasir allegedly beat and stabbed Williams, 70, with a knife, which investigators found 30 feet from Williams' body on the path into the homeless camp. 

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Police found Nasir in the camp with blood on his hands and clothes and fresh cuts on his hands. 

Witnesses told police they saw Nasir punching and kicking Williams. 

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Police arrested Nasir and charged him with criminal homicide and tampering with evidence. 

Nasir is in custody at the Allegheny County Jail awaiting arraignment. 

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No motive for the alleged assault and murder has been publicly revealed.