5 year old with repetitive speech and behavioral problems at school

(Ponca, NE)

My 5 year old just started kindergarten in August and was doing very well until recently. He has started having really odd behaviors and repeats words such as: kill, dead, weird, stupid, and ugly. We can't get him to stop if he is in public. Just last week the principal called saying he might need me to come get him because no one could calm him down. Apparently he was telling everyone he was going to kill them. We do not let him watch violent shows and do not let him say such things at home. However, lately he has been using the word STUPID non-stop in public with me. When I ask him to stop he says it more and then says "I do it on purpose." He has speech delays and is currently receiving OT at school for handwriting issues. We also started OT in an outpatient clinic due to sensory concerns.

I am wondering what my next step should be. Do we need to have him evaluated by a sensory specialist, neurologist, or behavioral specialist?? Maybe all of the above. He is usually very sweet, but if he is mad then watch out. My husband and I had him evaluated when he was 2 for autism, but we were told he did not have it. We are really wondering if he has SPD, ASD, or PDD-NOS. We love him no matter what, just would like some answers. :)