Five people, one house, and a Sunday that no one survived.

There is a particular horror in a family annihilation, a violence that turns inward and consumes the people who share a name and a history. In Mundelein, Illinois, a suburb north of Chicago, police responded to a well-being check late Sunday night and found five people shot to death inside a home on Wellington Avenue. On Tuesday, the Lake County Coroner's Office released their identities, and the shape of what happened became clear: a man had killed his parents, his son, and his longtime partner before turning the gun on himself.

The dead are James Schmidt, eighty, and Rebecca Schmidt, seventy-seven, who lived in the home. Their son, Bryan Schmidt, fifty-one, was found with an intraoral gunshot wound, a manner of death consistent with suicide. Also killed were Maclaine Schmidt, twenty-two, Bryan's son and the couple's grandson, and Nicole Heiser, thirty-seven, Bryan's longtime girlfriend . Autopsies determined that James and Rebecca died from multiple gunshot wounds, while Maclaine and Heiser died from gunshot wounds to the head .

The timeline, as investigators have reconstructed it, places the shootings between 11 a.m. and 2 p.m. on Sunday. Bryan Schmidt is believed to have shot the four others in close proximity to one another, and then killed himself. A handgun was recovered at the scene . Police were called at approximately 11:45 p.m., after someone requested a well-being check. By then, the house had been silent for hours.

There is no public indication yet of what prompted the killings. The investigation is ongoing, and police have not described a motive or a history of conflict. What is known is that the family lived in the home where the shootings occurred, and that the relationships were close: parents and adult son, a grandson, a partner of many years. These were not strangers to one another. They were a family, in the ordinary sense, gathered in a house on a Sunday.

The neighbor who called for the well-being check has not been identified, but the timing of the call suggests that something had already seemed wrong. Perhaps a missed appointment, an unanswered phone, a concern that grew over the course of the day. The call came late, after the shootings had already happened. The police who responded found what no one wants to find.

Mundelein is a village of about thirty-one thousand people, the kind of place where a murder-suicide involving five members of a single family is not an ordinary occurrence. The Lake County Coroner's Office released the identities in a news release, the language clinical and precise, as it must be. The names are now public: James, Rebecca, Bryan, Maclaine, Nicole. Five people who were alive on Sunday morning and were not by Monday.

The investigation will continue, and in time, a fuller account may emerge. What remains for now is the fact of the deaths and the absence they leave behind. A home on Wellington Avenue that is now a crime scene. A family that has ended in a way that no one who knew them could have predicted. And a community left to absorb a violence that happened behind a closed door, in the middle of a day, while the rest of the world went about its business.

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Sources: ABC7 Chicago, Daily Herald, Chicago Tribune, NBC 5 Chicago, Shaw Local