Yes.
Was the murder out of anger?
Yes.
Was Wayne knocked out before drowning?
Was the rain coat stolen?
Is the fact he was wearing a raincoat of significance? If so, was he wearing it properly (ie the right way round, and not, I dunno, tangled up it it somehow, or whatever)?
Did Wayne voluntarily put on the raincoat?
No.
No.
Yes and no. Yes.
Yes.
Did Wayne try to avoid drowning, ie struggle or fight or swim?
Please rephrase your question.
Did Wayne know he was going to be killed before the murder occured?
No.
Did the murderer drown?
No.
Does the raincoat belong to Wayne?
Does it belong to the Murderer?
No. No.
Is the owner of the raincoat significant?