Crime Solvers Central
Crime Solvers Central
302 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.

Case Description

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Summary based on the NamUs case record (MP25241) and 4 other sources
Alan Tigong Duque, a 19-year-old male, went missing from Daly City, California, on June 17, 1987. At the time of his disappearance, Duque was described as 5'5", weighing 120 pounds, with black hair and brown eyes. He was last seen wearing a dark blue jacket, a white shirt, Levi's jeans with a waist size of 33, and size 9 1/2 shoes. One distinguishing feature is a tattoo of the letters "LVN" on his right leg.

Little is known about the circumstances surrounding Duque's disappearance, and no updates or significant leads have emerged since that time. His case remains unsolved, and law enforcement continues to seek information from the public to help bring closure. If you have any details, the Daly City Police Department is overseeing the investigation and can be contacted with relevant information.

This case highlights the ongoing challenges faced by families and authorities when a loved one goes missing with few clues to follow. Alan Duque's disappearance is still listed as an active case, and anyone with knowledge that might assist is encouraged to come forward.

Last Seen: Jun 17, 1987

Possible Unidentified Matches (7)

Unidentified remains cases whose details are consistent with this person, ranked by how closely they compare. Fields that are unknown in either case are left out of the score.

82%Moderate
John Doe — Sausalito, California
UP7085 • Found Apr 26, 1996
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Sex ✓Male
Age 100%Est. 18–25 vs 19 when missing
Race 100%Asian
Location 100%12 mi away, same state
TimingFound 9 years after last seen
Height 68%5'8" vs 5'5"
Weight 100%130 lb vs 120 lb
Hair 100%Black vs Black
Eyes 100%Brown vs Brown
81%Moderate
John Doe — Oakland, California
UP55089 • Found Oct 6, 1989
View case
Sex ✓Male
Age 100%Est. 12–20 vs 19 when missing
Location 99%14 mi away, same state
TimingFound 2 years after last seen
Height 100%5'5"–5'6" vs 5'5"
Weight 95%135 lb vs 120 lb
Hair 100%Black vs Black
Eyes 100%Brown vs Brown
80%Moderate
John Doe — Muir Beach, California - unidentified case UP14895
John Doe — Muir Beach, California
UP14895 • Found Mar 3, 2016
View case
Sex ✓Male
Age 100%Est. 25–35 vs 19 when missing
Race 100%Asian
Location 99%13 mi away, same state
TimingFound 29 years after last seen
Height 100%5'4" vs 5'5"
Weight 47%160 lb vs 120 lb
Hair 100%Black vs Black
Eyes 100%Brown vs Brown
79%Possible
John Doe — San Bruno, California
UP10648 • Found Jul 19, 2007
View case
Sex ✓Male
Age 100%Est. 35–45 vs 19 when missing
Race 100%Asian
Location 100%5 mi away, same county
TimingFound 20 years after last seen
Height 84%5'7" vs 5'5"
Weight 21%171 lb vs 120 lb
Hair 100%Black vs Black
Eyes 100%Brown vs Brown
78%Possible
John Doe — Sausalito, California - unidentified case UP72097
John Doe — Sausalito, California
UP72097 • Found Jul 23, 2020
View case
Sex ✓Male
Age 100%Est. 50–60 vs 19 when missing
Race 100%Asian
Location 100%12 mi away, same state
TimingFound 33 years after last seen
Height 84%5'7" vs 5'5"
Weight 47%160–170 lb vs 120 lb
Hair 70%Gray vs Black
Eyes 100%Brown vs Brown
77%Possible
John Doe — Vallejo, California
UP142534 • Found Jul 31, 2024
View case
Sex ✓Male
Age 79%Est. 60–70 vs 19 when missing
Race 100%Asian
Location 94%31 mi away, same state
TimingFound 37 years after last seen
Height 100%5'3"–5'7" vs 5'5"
Weight 95%135 lb vs 120 lb
Hair 100%Black vs Black
Eyes 100%Brown vs Brown
76%Possible
John Doe — Santa Clara, California - unidentified case UP129838
John Doe — Santa Clara, California
UP129838 • Found Sep 14, 2021
View case
Sex ✓Male
Age 74%Est. 58–72 vs 19 when missing
Race 100%Asian
Location 93%35 mi away, same state
TimingFound 34 years after last seen
Height 100%5'6"–5'7" vs 5'5"
Weight 87%140–142 lb vs 120 lb
Hair 100%Black vs Black
Eyes 100%Brown vs Brown

These comparisons are generated automatically from public NamUs case data and are not confirmed identifications. Only DNA, dental or fingerprint comparison by investigators can confirm an identity. If you believe two cases are connected, contact the agency handling the unidentified case.

Unidentified photos are blurred because many are post-mortem. Tap a photo to reveal it.