1. Find his full name. Correct spelling. Aprox age. Height. Write down everything you and others remember about him, his family and friends. His old address. Hobbies. Year he moved in and out. Write down all your memories. Check his old home on google and zillow. Jog your memory and write in down in a few pages so an officer or an attorney can follow your story, and ask the right questions.
Google his name. Facebook his name. Do a White pages name look-up on line.
Even if statute has run for you, he will have more recent victims. If you need help, PM me.