'Cheer' Star Cassadee Dunlap's Father Shot in Arkansas

7:50 AM PT -- A spokesperson for Little Rock PD tells TMZ Dunlap had been out at a bar or club with his nephew prior to coming home, and it's believed he was intoxicated. When Dunlap got back to his apartment complex, he entered the wrong building and then forced his way into the wrong apartment. The homeowner shot him multiple times, as much as 5 or 6.

Cassadee Dunlap's father was shot this week ... this after there was reportedly a mix-up on whose home he was in.

The Netflix star -- who appeared on the second season of "Cheer" -- hasn't publicly addressed the incident, but we've learned the man identified by authorities after Saturday's shooting, Ronald Dunlap, is in fact Cassadee's dad.

According to reports, cops say he's in critical condition after he somehow made his way into someone's apartment in Little Rock, seemingly by mistake, in the middle of the night ... and was shot by the homeowner.

It's unclear how or why this unfolded the way it did, but the person who shot Dunlap told authorities they heard someone banging at their door around 3 AM and then -- thinking there was a stranger in their kitchen -- fired several rounds, striking Dunlap.

Dunlap's brother, David, says he's still in the hospital and fighting for his life.

A neighbor's door was apparently also hit by bullets, but no other injuries have been reported. It does not appear any charges have been filed thus far either.

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