Police say the 46-year-old Thomas was driving a B46 bus in Brooklyn when a man boarded through the exit door. They say Thomas denied the man a transfer slip and argued with him before being punched in the head and stabbed.
A 20-year-old man identified by witnesses has been charged with murder. Police say he's confessed to the stabbing.
Thomas leaves a wife and two teenage children.
Mayor Michael Bloomberg praised Thomas for his service to the city.
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