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Ventura County Sheriff's Office
Tuesday March 10th, 2020 :: 03:45 p.m. PDT


Newbury Park - Missing Person

Nature of Incident: Missing Person
Report Number: RB# 20-35978
Location: 100 block N Dewey Avenue, Newbury Park
Date & Time: 03/04/2020 @ 7:50 AM
Unit(s) Responsible: Thousand Oaks Patrol & Thousand Oaks Investigations

City of Residence

Dyllan Hawk Mason Thousand Oaks  
On 03/04/2020, at approximately 7:50 AM, Dyllan Mason left his residence in Thousand Oaks, CA and never returned.  A note indicating that Dyllan may be suicidal was located at his residence and a semi-automatic pistol was missing from the residence.  Dyllan drives a gold 2005 Lexus ES330 sedan, Oregon License Plate # 874KJC. 
Thousand Oaks Patrol deputies initiated the investigation on March 4, 2020.  Since then, Thousand Oaks Investigations detectives have used numerous methods to search for Dyllan and his vehicle with negative results. 
Please call 911 if Dyllan or his gold Lexus are located.  Please do not attempt to contact Dyllan or approach his vehicle, as he may be armed with a pistol.  There is nothing to indicate that Dyllan is a threat to the public.
Prepared by: Detective Mark Bastiaans  
News Release Date: March 10, 2020  
Media Follow-Up Contact: Detective Mark Bastiaans
Phone:  805-947-8287
[email protected]
Approved by:
Captain Denise Sliva

Ventura County Sheriff's Office
800 S Victoria Ave
Ventura, CA 93003

Emergency: 9-1-1
Non-emergencies: 805-654-9511

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