He was an unnamed jail guard in Ghostbusters wearing a police uniform

He was Sgt. Al Powell the cop who liked the twinkes in Die Hard, again wearing the cop uniform,

And he was a cop in Family Matters where he played Carl Winslow, again a uniform cop.

He moved away from New York after all the freaky shit went down with the ghosts to Los Angeles where he was a cop again but left after the whole Nakatomi Towers fiasco and settled down in Chicago only to be tormented by Urkel for the next decade.

Therefore Ghostbusters, Die Hard and Family Matters are in the same universe.