Why would a Policeman shoot an autistic patient ? Its quite clear from the video, that the Police were informed that he was autistic and that he was playing with a toy truck. Neither him, nor the therapist presented any danger to the Police or public whatsoever.
It appears that the Officer has been placed on "administrative leave without pay" I am not exactly sure what that means in American English, but perhaps it means he is suspended.
If you look at the following CNN link, in the second small video clip, it appears that the local Authorities have now admitted the Policemans guilt, using words such as "totally violated his trust from the public that he protects and serves"
http://edition.cnn.com/2016/07/21/us/miami-officer-involved-shooting/index.html