Tā shì gè guòlùrén, hé zhè jiàn shì méiyǒu guānxi.
He was just a passerby and had nothing to do with the matter.
Tips
usage
过路 can function as a verb (to pass by) or as an attributive adjective modifying a noun (过路人 = passerby, 过路车 = passing vehicle, 过路费 = toll). It implies transience — just passing through without staying.
