A teenage girl survived and was in stable condition, police said.
Chad Hickman, 39, was found dead after a wide search in Missaukee County, police said.
Police released the ages and genders of the victims on Saturday but did not specify whether they were related to each other or the suspect.
Officers responded to reports of a shooting at a home about 270km northwest of Detroit on Friday morning and found the bodies of a 16-year-old boy, a 45-year-old man and a 40-year-old woman, and a 13-year-old girl in critical condition, Michigan State Police said.
Authorities say Hickman fled the scene, leading to a large-scale search.
Police found the body of a 53-year-old man at a second home, and then a 29-year-old woman, dead alongside Hickman, in the woods.
All the victims died of gunshot wounds, police said.
"This situation is heartbreaking for the community and challenging for the investigators involved," police spokesman Ashley Miller said in a statement on Friday.
Miller said on Saturday the investigation was ongoing.
Hickman was convicted in 2024 of misdemeanour fourth-degree child abuse, according to court records.
He was sentenced to one year in jail.
In the same case, the court dismissed felony assault and criminal sexual conduct charges.
Tim Penrose, who lives on the street where the 53-year-old was found dead, said Hickman lived in that home.
Penrose said he heard shots but didn't think much of it until police arrived because he lives in a rural area where gunfire is not uncommon.
Governor Gretchen Whitmer said on Friday she was monitoring the situation.
"My thoughts are with the victims, their families, and the Missaukee community," she said.
