Phil Dawson

WZZM

HOLLAND TOWNSHIP, Mich. – Right now, a murder-suicide might appear the only explanation that seems to fit the facts, but detectives say they want to make sure before reaching any final conclusion.

They're investigating the deaths of 59-year-old Gary Volkers and his 31-year-old daughter, Stacey Grotenhuis. Volkers' body was found Sunday afternoon in Osceola County's LeRoy Township. Evidence there pointed investigators to Volkers's condo, where they found Grotenhuis' body.

Michigan State Police say it's pretty clear Grotenhuis was murdered. The nature of her father's death is still in question. Detectives do say they aren't looking for any suspects and they don't think anyone else was involved.

"I've never been through anything like this before," said Deb Anderson, who lives in the unit next door to Volkers's at the Crystal Waters Condominium Community. "There was never any arguing or fighting or anything like that" between Volkers and Grotenhuis, Anderson said, saying the two always seemed affectionate.

Anderson knew the two in passing, saying, "I would just see them come in and out, and it would be a casual hello -- and that would be about it."

Anderson said she understood Volkers didn't have many people very close to him; Grotenhuis had recently moved to Michigan from out of state.

"She hasn't actually been here that long," Anderson said. "How somebody could do that -- it's beyond me," she says of the murder. "It's very hard, very difficult."

Police are not saying anything yet about how the father and his daughter died, any weapons investigators may have found, wounds they noticed or any possible motive.