Jennifer finds the body of a local college history professor hidden in a suit of armor she purchased. After the professor's teaching assistant becomes the next victim, Jennifer finds herself caught in a killer's web of dangerous lies.
Unfortunately the movie Garage Sale Mystery: Murder Most Medieval is not yet available on HBO Max.
| Production | Jackie Lind | Casting |
| Art | Jill Scott | Production Design |
| Production | Allen Lewis | Supervising Producer |
| Production | Katy Garretson | Supervising Producer |
| Production | Marnie Termuende | Supervising Producer |
| Production | Lori Loughlin | Executive Producer |
| Production | Michael Shepard | Executive Producer |
| Production | Marnie Termuende | Executive Producer |
| Production | Jonathan Axelrod | Executive Producer |
| Production | Alan Ett | Executive Producer |
| Production | Harvey Kahn | Producer |
| Crew | Kirk Jaques | Stunt Double |
| Crew | Timothy Wallace | Stunts |
| Crew | Troy Rudolph | Stunts |
| Crew | Thomas Potter | Stunts |
| Crew | Brett Armstrong | Stunt Double |
| Crew | Timothy Wallace | Stunt Double |
| Crew | Byron Brisco | Stunt Double |
| Production | Jamie Lake | Production Manager |
| Directing | Bill Mizel | First Assistant Director |
| Directing | Sarah Rogers | Second Assistant Director |
| Costume & Make-Up | Jaralin Detienne | Costume Designer |
| Costume & Make-Up | Emily Gray | Costume Designer |
| Costume & Make-Up | Julia Boyce-Sargent | Costume Set Supervisor |
| Costume & Make-Up | Raven G. Basi | Truck Costumer |
| Art | Mark Boyko | Set Decoration |
| Art | Sheldon Feyter | Assistant Set Decoration |
| Art | Ryan Casey | Leadman |
| Art | Todd Boyko | Set Dresser |
| Art | John Morstad | Property Master |
| Art | Raquel Fors | Assistant Property Master |
| Art | Melanie Yip | Props |
| Costume & Make-Up | Pam Anseeuw | Key Makeup Artist |
| Costume & Make-Up | Shelly E. Jones | Key Hair Stylist |
| Costume & Make-Up | Denean Dale | Assistant Makeup Artist |
| Costume & Make-Up | Jillian Tymos | Assistant Hairstylist |
| Production | Sara Brown | Extras Casting |
| Production | Rachel Klinosky | Extras Casting Assistant |
| Camera | Sean Cox | "A" Camera Operator |
| Camera | Jenna Fuoco | First Assistant "A" Camera |
| Camera | Owen Wong | Second Assistant "A" Camera |
| Camera | David Tenniswood | "B" Camera Operator |
| Camera | Trevor Komori | First Assistant "A" Camera |
| Camera | Steven Singh | Second Assistant "B" Camera |
| Camera | Ryan Plummer | Still Photographer |
| Sound | Tad Nazar | Production Sound Mixer |
| Sound | Eric Weisner | Boom Operator |
| Lighting | Geoff Dane | Gaffer |
| Lighting | Alexander Ma | Best Boy Electric |
| Camera | Corey Tremblay | Key Grip |
| Camera | Keith Granger | Best Boy Grip |
| Camera | Steve Mieszkalski | Dolly Grip |
| Directing | Lee Karlovic | Third Assistant Director |
| Production | Yale Kussin | Production Coordinator |
| Production | Laura Obenaus | Assistant Production Coordinator |
| Production | Adrian Bojidar | Assistant Production Coordinator |
| Production | Matt Visser | Assistant Production Coordinator |
| Crew | Marnie Termuende | Production Controller |
| Production | Svatia Sakarova | Production Accountant |
| Production | Faiza Lalani | Assistant Accountant |
| Production | Susan Messent | Assistant Accountant |
| Production | Leannie Aalgaard | Payroll Accountant |
| Production | Geoffrey Dodd | Location Manager |
| Production | Steve Kinghorn | Assistant Location Manager |
| Directing | Kay Metchie | Script Supervisor |
| Directing | Julie Webster | Script Supervisor |
| Crew | Dean Fitzpatrick | Transportation Coordinator |
| Crew | Stephano Chimarios | Transportation Captain |
| Crew | Sean Hanlin | Security Coordinator |
| Crew | Bridget Beall | Craft Service |
| Crew | Danielle Salisbury | Craft Service |
| Crew | Jason Macintyre | Post Production Supervisor |
| Production | Nikki Lee | Post Production Coordinator |
| Editing | Mark Adams | Assistant Editor |
| Editing | Michael Jacobsen | Assistant Editor |
| Editing | Oliver Granillo | Online Editor |
| Visual Effects | Barry Liu | Visual Effects Supervisor |
| Sound | Miguel Nunes | Sound Re-Recording Mixer |
| Sound | Miguel Nunes | Supervising Sound Editor |
| Sound | Eric Mouawad | Dialogue Editor |
| Sound | Ryan Thompson | Sound Effects Editor |
| Sound | Jay Cheetham | Sound Editor |
| Sound | Alex Macia | Foley Artist |
| Sound | Devon Quelch | Foley Artist |
| Writing | Suzi Weinert | Novel |
| Writing | Walter Klenhard | Writer |
| Directing | Neill Fearnley | Director |
| Crew | Brett Armstrong | Stunt Coordinator |
| Camera | Randal Platt | Director of Photography |
| Editing | Nicole Ratcliffe | Editor |
| Production | Harvey Kahn | Executive Producer |
| Sound | Terry Frewer | Original Music Composer |
