207 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.
Case Description
Any updates on this case?
William D. Sinclair, a 29-year-old man from Hopkins, Minnesota, disappeared on April 28, 1978, under suspicious circumstances. He was last seen attending a party on 11th Avenue South, near the Hopkins Police Department. After the party, Sinclair vanished, and his car was found abandoned nearby. The keys were still in the ignition, and his eyeglasses were discovered on the floor of the vehicle, but there were no signs of him at the scene.
Sinclair was last seen wearing a blue jacket, a d ...Read More
Last Seen: Apr 28, 1978
Sinclair was last seen wearing a blue jacket, a d ...Read More
Last Seen: Apr 28, 1978
Links to Additional Sources (6)
See any mistakes?Victim Details
Jun 28, 2013
Jan 09, 2024
William
Sinclair
75
29
68 inches
130 lbs
White / Caucasian
Male
Apr 28, 1978
Hopkins
Minnesota
Hennepin County
No
252
31342
Hopkins Police Department
Hopkins
Minnesota
Hennepin County
55343
1010 1st Street South, Minnesota
9522585321
Local
Law Enforcement
78004005
Hopkins Police Department
Brown
Hazel
Hazel
11/23/2025
Area Last Seen:
Forum Posts (3)
I've been diving into the mysterious disappearance of William D. Sinclair for a while now, and somet... ...Read More
05/06/2024
05/06/2024
Has anyone else looked into the area around where William Sinclair’s car was found? I’ve been di... ...Read More
08/03/2023
08/03/2023
I was re-reading about the William D. Sinclair case, and something that stands out to me are the cir... ...Read More
07/01/2023
07/01/2023
