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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witness
Lead #1Spouse was away from residence for several hours—what time did she leave and return, and did anyone see Thornton during that window?
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clue
Lead #2Why did Thornton leave without apparent preparation or communication, and were there any prior incidents suggesting he might leave suddenly?
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location
Lead #3Where would a 63-year-old man with no specific suicide threats be likely to go on foot from Milpitas?
Mark Herbert Thornton, a 63-year-old man, disappeared from his Milpitas home on March 7, 2019, after a heated financial discussion with his spouse. He walked away from the residence and has not been located since, leaving behind significant questions about his whereabouts and circumstances. Anyone with information about Thornton's location or activities following his departure is urged to contact the Milpitas Police Department.
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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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evidence
Lead #4Have his credit cards, phone, or bank accounts shown any activity since March 7, 2019?
Have information about any of these leads?
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 Missing
Thornton walked away from his residence following a heated discussion with his spouse about finances. 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 28, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 4085862400
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Case Information
Incident:March 7, 2019
Last Updated:September 28, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 4085862400
You can remain anonymous