"Anyone with a shred of integrity, love or respect for my sisters family won't share those details until the investigation allows," wrote Molly Cessna.
Local religious institutions arranged public gatherings to support grieving residents.
"Over the past few days, our Grand Haven community has been deeply affected by the tragic loss of the Karolkiewicz family," stated St. Patrick's Parish, Grand Haven Church.
"We continue to pray for the repose of their souls and for their family and friends who grieve ...
all are welcome as we come together in prayer for our community."
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The Ottawa County Sheriff's Office requested anyone with additional information to contact their office or submit anonymous tips through Silent Observer.
