It is news most in South Bend were expecting.
South Bend Mayor Stephen Luecke will announce his plans for a fourth term later this week.
The Democrat has called a news conference for Thursday at noon in the County-City Building to make the announcement.
Three other people have already announced they want the job.
Luecke will be challenged in the primary by William Davis.
Terry Miller and Juan Manigault will face off for the Republican nomination.