Police Chief Rusty York said the hostage-taker, Kenneth Knight, 45, was killed by a single shot, The (Fort Wayne) Journal Gazette reported. Police spokeswoman Raquel Foster said officers carried the boy out of the home, the newspaper said.
The by's condition was not reported.
Police said a fellow passenger pulled the slain woman off a Citilink bus shortly before 8 a.m. local time and shot her to death with a shotgun on a sidewalk about 25 feet away, the newspaper reported. The Allen County Coroner's Office identified the victim as Jacqueline Bouvier Hardy, 49, of Fort Wayne.
The gunman fled on foot through the neighborhood and police said they located him at the house where the boy was held hostage.
Police said they did not believe the woman's shooting death was random.
Several passengers were on the bus. Police did not say whether they witnessed the shooting.
Foster said a protective order had been filed against Knight in recent days, but did not reveal who had sought the order, the newspaper said.