State prosecutors had previously charged the man with second-degree murder in the deaths of State Representative Melissa Hortman and her husband.

© Tim Gruber for The New York Times

Mary Sheffield and Solomon Kinloch Jr. will face off in a November election. Mike Duggan, Detroit’s mayor for a dozen years, is not seeking re-election.

© Sylvia Jarrus for The New York Times

Several candidates want to replace Mike Duggan, the only mayor the city has had since its financial crisis. Detroit’s next challenge, residents say, will be reviving forgotten neighborhoods.

© Sylvia Jarrus for The New York Times