Date of birth suggested by Mary Doersam (#48644389)
I am unable to verify.

I have found many accounts of the story that Simon Garlick died after being shot January 1885 in Chaneysville, Bedford County, PA. His father, Adam Garlick brought charges in December 1885 against Lewis Lashley and John Gordon. They were honorably acquitted of any charge of murder in January 1886.
Everett Press, Everett, PA
Wednesday, January 20, 1886; Page 1.

I can't account for the Michigan Death Record.
This can't be the same Simon Garlick. The name may be in error. I can't find any newspaper article to confirm this record.
Michigan, Deaths and Burials Index, 1867-1995
Name: Simon Garlick
Birth Date: abt 1863
Birth Place: Penn.
Death Date: 29 Dec 1885
Death Place: Spring Lake, Ottawa, Mich.
Death Age: 22
Occupation: Teamster
Race: White
Marital status: Single
Gender: Male
Father Name: Adam Garlick
Mother Name: Margret Garlick
FHL Film Number: 984237

1880 United States Federal Census
Name: Simon Garlic
[Simon Garlick]
[Simon Garlock]
Age: 18
Birth Date: Abt 1862
Birthplace: Pennsylvania
Home in 1880: East Providence, Bedford, PA
Relation to Head of House: Son
Marital status: Single
Father's name: Adam Garlic
Father's Birthplace: Pennsylvania
Mother's name: Margret Garlic
Mother's Birthplace: Pennsylvania
Occupation: Hauling Bark
Name Age
Adam Garlic 45
Margret Garlic 33
John Wesley Garlic 22
Martha Garlic 21
Daniel L. Garlic 19
Simon Garlic 18 ***
Margret A. Garlic 12
Elliot Garlic 10
Ida Garlic 9
Emory Garlic 6
Harry Garlic 4
Adam Lewis Garlic 6/12
George D. Lashley 1/12

1870 United States Federal Census
Name: Simon Garlick
Age in 1870: 7
Birth Year: abt 1863
Birthplace: Pennsylvania
Home in 1870: Monroe, Bedford, Pa
Post Office: Clearville
Name Age
Adams Garlick 35
Margaret Garlick 33
Amanda Garlick 13
John thesly Garlick 12
Martha Garlick 10
Daniel Garlick 9
Simon Garlick 7 ***
Margaret A Garlick 2
Elliott Garlick 2/12
Joseph Garlick 24
Peter Garlick