The guy who unleashed that racist tirade on his Black neighbor — before getting hauled away by cops — could have more trouble on the horizon … as prosecutors in New Jersey dig into past allegations of similar incidents.

Sources with direct knowledge of the case… Edward Cagney Mathews is being investigated by the Burlington County Prosecutor’s Office … not just for last week’s ugly run-in and arrest, but for several other allegations — including a 2016 confrontation with a Black woman named Jazmyn Jene.

Jazmyn tells us she exchanged words with Mathews within the condo community where they both lived, and she captured a good chunk of their wild — and seemingly threatening — interaction on camera.

In the video, Mathews openly claims to have cops in his back pocket, and he’s giving Jazmyn 2 options: handle a dispute they were having cordially, or legally. He strongly suggests the legal route won’t work, because he’s so tight with cops … they wouldn’t do anything to him.

Eventually, things get racial — Jazmyn accuses him of hurling the n-word — which Mathews somewhat denies by clarifying he did use the word, but not the way she’s suggesting. You can see in the video … it’s a pretty weak defense.

Now, she says she did report the incident at the time, but nothing came of it. However, since Mathews’ arrest — as scores of angry neighbors jeered and hurled objects — Jazmyn says investigators have apologized to her for not acting earlier.

We’re told Jazmyn has shared the video of her run-in with Mathews with law enforcement, and it will be included in prosecutor’s expanded probe.