On of my two near midairs in a lifetime (so far) was 3 miles W of DVT and was commanded by ATC.
Be careful out there!
May all the aviators involved in this accident RIP.
My one near-midair was at DXR, and also was ATC-assisted. But ultimately, it was my fault.
A thick, unexpected fog had blanketed the area. I'd just managed to fly 10 miles through it in a Cub to find the airport, and I was frankly overjoyed to be back in the pattern.
Because of the fog, ATC wanted to keep me close, and told me to turn base and follow another student pilot in a Cessna. But even through the fog, I could see the runway over my shoulder -- but I couldn't see the Cessna. Had he been where he was supposed to be, I would have seen him.
My instincts told me to extend downwind until I saw the Cessna, and then turn base behind him. But I was too new, too much a student pilot, and too much flying an old Cub in the fog, to trust my instincts. So I turned base -- and then I saw the face of the kid in the Cessna at about two o'clock. That's much too close for comfort.
He was coming in a bit low because he'd misjudged his distance, and I was still high because of the short downwind. So I punched the throttle and flew directly over him at 90 degrees, with maybe 300 to 400 feet of vertical separation between us. Then I did a right 270 and came in behind him while considering which cuss words to hurl at the guy in the tower once I got on the ground.
But by the time I landed, I'd accepted that it was my fault, not ATC's. I could see that the Cessna wasn't in front of me, so obviously he was behind me. Student pilot or not, fog or not, vintage Cub or not, only an idiot would turn base in that situation.
But God must have a soft spot for fools, because I lived to tell about it; so it became a powerful and early lesson learned, rather than a news story.
-Rich