That's very dark brown hair compared to the hair on the unidentified person's composite picture, IMO.
Search results for brown, light brown, dark blonde, dark strawberry blonde, auburn could all match if there's heavy red high lights. Not every description in the missing person database is going to have an accurate hair color, and the report might fail to mention red highlights. If there's a picture showing hair to be way too dark or way too light, I feel the detectives can easily rule it out. But if there is no picture or the picture isn't too dark or light and it's difficult to tell one way or another if there is red, it really doesn't matter how it's defined in the database IMO.