DeMar DeRozan's 7-year-old daughter is a hero -- because she's the one who spotted an intruder at their L.A. home and immediately sounded the alarm leading to his arrest ... this, according to law enforcement.
Officials say there's video surveillance that shows the suspect -- 22-year-old Justin Bergquist -- peeping inside DeRozan's house on Nov. 19 around 7 PM.
The footage also allegedly shows Bergquist entering the home through a sliding glass door. Officials say he spent 17 minutes inside the home -- shirtless -- until he ran into DeMar's daughter.
According to the police report, "When the suspect saw [DeMar's daughter], he put his finger to his lips and signaled for her to be quiet."
But, DeMar's daughter knew better ... and smartly ran downstairs and screamed for her parents.
That's when DeMar sprung into action -- scouring the house for the suspect, who made a break for it and ultimately fled from the home.
DeMar's GF called 911 -- and the L.A. County Sheriff's Dept. responded to the scene. Bergquist was eventually located and arrested.