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

Michael Knapstein Missing Person Case

Last seen in Winter Haven, Florida on Jul 29, 2020

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Victim Details

Created

Jul 31, 2020

Case Added

Nov 15, 2023

First Name

Michael

Last Name

Knapstein

Current Age

Age At Disappearance

Height

70 inches

Height To

71 inches

Weight

190 lbs

Weight To

210 lbs

Ethnicity

White / Caucasian

Gender

Male

Last Seen

Jul 29, 2020

City

Winter Haven

State

Florida

County

Polk County

Tribal Land

Agency ID

90077

Agency Name

Polk County Sheriff's Office

Agency City

Winter Haven

Agency State

Florida

Agency County

Polk County

Agency Zip Code

33880

Agency Contact

Mario Hernandez

Contact Job Title

Detective

Agency Address

1891 Jim Keene Boulevard, Florida

Agency Phone

8632986834

Agency Jurisdiction

County

Agency Type

Law Enforcement

Agency Case #

#2020-29449

Agency Report Date

Jul 30, 2020

Primary Agency

Polk County Sheriff's Office

Case Contributors

7338

Hair Color

Gray or Partially Gray

Left Eye Color

Green

Right Eye Color

Green

Last Updated

Oct 11, 2026

Area Last Seen:

Case Description

Any updates on this case? Let us know!

Summary based on the NamUs case record (MP72284) and 4 other sources

Michael Knapstein, a 59-year-old man from Winter Haven, Florida, was last seen on July 29, 2020, leaving his home on Avenue A SE. Two days later, his vehicle was located abandoned at a business on Cypress Gardens Boulevard. At the time of his disappearance, Knapstein was described as 5'11" tall, weighing approximately 200 pounds, with gray hair and blue eyes. He had medical conditions but did not have his medication with him, which raised concerns about his well-being. Local hospitals were checked, but no trace of him was found.

The Polk County Sheriff's Office issued a missing person alert and classified him as endangered due to his health conditions and the circumstances of his disappearance. Despite ongoing efforts by authorities, Knapstein has not been located, and the case remains unsolved.
Last Seen: Jul 29, 2020

Links to Additional Sources (4)

See any mistakes? Let us know!

Missing Person / NamUs #MP72284

Sheriff's Office: Search continues for missing Winter Haven man

Missing Person Alert in Winter Haven - DailyRidge.com

Michael Knapstein is still... - Missing Person Support Center

Possible Unidentified Matches (1)

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.

75%Possible

John Doe — Auburndale, Florida

UP91920 • Found Feb 25, 2021

View case

Sex ✓Male

Age 100%Est. 48–62 vs 59

Location 100%6 mi away, same county

TimingFound 7 months after last seen

Height 75%5'5"–6'1" vs 5'10"–5'11"

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.

Michael Knapstein Missing Person Case

Last seen in Winter Haven, Florida on Jul 29, 2020

Victim Details

Case Description

Links to Additional Sources (4)

Possible Unidentified Matches (1)

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Forum Posts (1)

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