According to authorities, the 49-year-old victim, who lived near the scene, was crossing the street when he was killed.
Police soon were looking for a silver BMW and found it a few blocks away on Clarissa Street.
They say the driver was Rios who hit a barrier in the 4300 block where the car went airborne for a time, crashed into another car traveling from the opposite direction, and then caught fire.
Veteran SEPTA bus driver Joe Wilson was the first to come up on the scene as he drove on his regular route along the 1600-block of Erie.
"I see the body laying on the street, blood pouring out of his head and everything, I stopped the bus, jumped off, went over to the gentleman to see if he was still breathing, felt for a pulse. I felt nothing," Wilson said.
Chief Inspector Scott Small says Rios tried to run from police but was detained.
Rios is charged with homicide by vehicle, involuntary manslaughter, driving under the influence and other charges.
Police have not released the identity of the 49-year-old victim.
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The AP contributed to the story.
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