My guess would be around 5' 6"-5' 8". His shoe size is much too large for smaller person, in my opinion. He would be out of porportion if he were any less than 5' 6" plus. His shoe is very visable.
I found a very clear pic on CTV and played with it a bit. I am convinced that is no baseball cap turned any way on his head. It looks to me like either a "doo-rag" with a thicker roll around his head or possibly a knit cap rolled there. I don't see ballcap whatsoever. I think LE missed the boat on that, too.
My guess is 5:8-5"10. But, i would be a fool if I said I was convinced. I compared his height mentally to the male police officer who was doing the estimating, and the POI seemed a tad under his height. The POI seemed much taller than the female officer. Not even close in my mind. One would assume she was 5:2 or so.
AS for his head, you don't see a possibility of a helmet, bicycle perhaps, or one of those small skate board helmets? I saw a kid tonight with a skateboarding helmet, and it looked liked a possible.
That is why a re-enactment with both male and female, tall, short, wearing hats, skateboard helmets, construction helmets, berets, hats-backward and forward, do-rags, different pants, sweats, tennis shoes, bicycle shoes, etc., would just be so valueable and so inexpensive to do. Why haven't then done this (assuming it hasn't been done)? Just do the experiment at noon, and try to duplicate the circumstances.
It's weird, in the first picture, it looks like a beret or hat to me, in the second, it looks like whatever is on his head is elevated, meaning not stuck to the head. Which could mean do-rag, which are used by many.
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ps SS. Originally, LE thought the POI had a "funky" haircut and LE went to different hair salons trying to get someone to i.d. the haircut.