Seems a lot like a HIT.
Jealous husband?
I doubt a ‘hit-man’ would do this in broad daylight.
I’d guess it’s someone with a grudge. Money involved, botched medical treatment, drugs...a po’d husband or boyfriend, payback of some kind. It’s probably be a safe bet it wasn’t random.
The perp has a very large back pack, unusual for a cyclist. Perhaps containing a quich change of clothes?
My best guess is it’s Howard Hunt
The doctor was on a bicycle, too?
For this to be a hit somebody would have needed to follow the doctor for days or weeks to establish his schedule. Also, why not hit him at a more private place, like his home or during an after dark outing for dinner or to a shopping center? Perhaps the doctor had a home with security cameras and there are too many cameras at shopping centers and work parking lots. That backpack and the clothes were probably dumped within blocks of the killing. Or, there was a car or, more likely, a van parked somewhere nearby. This is very odd. It’s hard to believe a prominent surgeon was involved in something that would precipitate a hit this expensive and time consuming to set up.