The person at the center of this case
Mark Herbert Thornton
Missing Person · Open
7 years waiting · since 2019
Missing Person: Mark Herbert Thornton
Justice for Mark Herbert Thornton — the trail went cold in 2019, but the truth hasn't.
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Key leads to think about
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timeline
Lead #1Was Thornton's departure voluntary or involuntary? The heated financial discussion with his spouse is the last known context.
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location
Lead #2Where did Thornton go after leaving his residence on foot? What routes or destinations might he have taken?
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evidence
Lead #3No specific threats of suicide were noted, but his mental state and intentions at the time of disappearance remain unknown.
Mark Herbert Thornton, a 63-year-old man, disappeared on March 7, 2019, from his residence in Milpitas, California following a heated discussion with his spouse about finances. He left the home on foot and has not been seen since. The circumstances of his disappearance—whether voluntary departure or foul play—remain unclear, and investigators continue to seek information about his whereabouts.
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More leads to consider
Beyond the top three above — each detail below could be the thread that pulls this case open.
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witness
Lead #4Did anyone see Thornton walking in the Milpitas area on March 7, 2019, or in the days following his disappearance?
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Even the smallest detail could be the key to solving this case.
Official wording
Source Narrative
NamUs case MP56994. Missing person: Mark Herbert Thornton.
Last known contact: 2019-03-07 in Milpitas, Santa Clara, CA. Circumstances: Thornton had a heated discussion with his spouse about finances.
His spouse left the residence for several hours and when she returned home the subject was gone. Thornton walked away from the residence last seen wearing Black jeans, gray hiking shoes (NFI).
No specific threats of suicide. Demographics: 63 years, Male, White / Caucasian.
Physical description: 5 ft 7 in, 150 lbs, hair: Gray or Partially Gray, eyes: Blue. Clothing and accessories: Clothing: Black pants, black jacket, red shirt; Footwear: Grey colored hiking boots.
Investigating agency: Milpitas Police Department | 19-066-153 | 2019-03-07.
Timeline of Events
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2019-03-07
Mark Herbert Thornton goes missing
Following a heated discussion with his spouse about finances, Thornton walked away from his residence in Milpitas. He was last seen wearing black jeans, gray hiking shoes, black jacket, and red shirt.
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:March 7, 2019
Last Updated:September 4, 2026
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Phone: 4085862400
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Case Information
Incident:March 7, 2019
Last Updated:September 4, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 4085862400
You can remain anonymous