updated 10/1/2008 5:34:17 PM ET 2008-10-01T21:34:17

Authorities say autopsies performed on four bodies found inside a burned-out home near Grand Rapids, Mich., show that all were slain before fire destroyed the structure.

Ottawa County sheriff's Lt. Mark Bennett told The Grand Rapids Press for a story Wednesday that the four were found dead early Monday in a house in Wright Township.

Killed were 53-year-old Sharmaine Zimmer, her 20-year-old son Jeremy, her 17-year-old son Tyler and Jeremy's 18-year-old girlfriend, Katherine Brown of Conklin.

Authorities haven't said how the victims died. Bennett says detectives haven't ruled whether the fire was intentionally set.

The county sheriff's office, state police and the state fire marshal's office are investigating.

Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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