Fetching details from the dictionary...
person given as a reference; witness
potential suspect; person of interest
witness
参考人として呼ばれた。
I was called as a witness.
検察が参考人から話を聞いた。
The prosecutor heard from a witness.
委員会は複数の参考人を招いて意見を聴取した。
The committee invited multiple witnesses and heard their opinions.