Cook beef, bell pepper, and next 2 ingredients in a Dutch oven over medium-high heat until meat crumbles and is no longer pink. Drain well, and return to Dutch oven.
Stir in tomatoes and next 5 ingredients; bring to a boil over medium-high heat. Cover, reduce heat to medium-low, and simmer, stirring occasionally, 15 minutes. Stir in corn, and cook, uncovered, 15 minutes or until squash is tender and chili is thickened.