You can go to the web site for the Department of Corrections. I also recommend you use a web site that performs background checks which includes criminal convictions.
To find a convicted felon do seacrh the court records. You can use online system to find records by using a name search and type of case criminal or civil.
Felony convictions would be a public record. You can generally do a search by the person's name at the county court house to see if they have any convictions. Some counties also post many of their court records online.