Skip to main content

About me

Kenneth practices in the areas of criminal defense, family law, juvenile law, and workers' compensation. Kenneth's skill was recognized in 2015 when he was made a member of the National Trial Lawyers Top 100 Criminal Trial Lawyers.


Kenneth was a deputy prosecuting attorney in Gillette, Campbell County, Wyoming for almost two years before opening a private practice with his wife, Erin Mercer. Kenneth and Erin ran Plains Law Offices, LLP until 2011, when Kenneth was elected as county and prosecuting attorney for Johnson County, Wyoming.


As county and prosecuting attorney for Johnson County, Kenneth worked almost exclusively in criminal and juvenile law. Kenneth's knowledge of the criminal and juvenile courts is substantial. Kenneth has been lead attorney in over twenty serious felony jury trials for crimes such as murder, sexual abuse, drug trafficking and more. Kenneth has resolved over 200 felony cases and many more misdemeanors.


Kenneth has also been counsel in many juvenile cases and petitions for the termination of parental rights. Kenneth understands what parents need to do to protect their children and be reunited with children that have been removed from the home.


Kenneth also works with children who are accused of committing crimes and their parents. He will explain the law and walk you and your child through the process, always working for the best interests of your child.


Divorce, custody and other family issues are emotionally charged and involve some of the most important decisions one can make in thier lifetime.  Kenneth understands the legal system and can help you make sense of a senseless time.  Know and protect your rights and your family.


Having the right attorney in any circumstance, makes all the difference!


Practice areas


  1. Workers Compensation: 30%
    9 years, 150 cases
  2. Family: 30%
    9 years, 150 cases
  3. Criminal Defense: 30%
    9 years, 1 thousand cases
  4. Juvenile: 10%
    14 years, 200 cases


Payment types:

Cash, Check

Attorney endorsements

1 total 

Are you an attorney? Endorse this lawyer

  • Richard Allen Erb Jr.

    I fully endorse Ken DeCock. I have known him both as an attorney in the same legal community, and as an opposing attorney. I know him to be a man of integrity, and I hold him in high regard.


    Richard Erb Personal Injury Attorney
    Relationship: Fellow lawyer in community

Contact info

Plains Law Offices, LLP

1949 Sugarland Drive, Suite 221
Sheridan, WY, 82801


WYAuthorized to practice law200108/27/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Top 100 Criminal Trial LawyersThe National Trial Lawyers2015
Work experience
TitleCompany nameDuration
PartnerPlains Law Offices, LLP2015 - Present
County & Prosecuting AttorneyJohnson County Prosecutor's Office2011 - 2015
PartnerPlains Law Offices, LLP2003 - 2011
Deputy County AttorneyCampbell County Attorney2002 - 2003
Association namePosition nameDuration
Wyoming State BarN/A2001 - Present
Legal cases
Case nameOutcome
Knapp v. LandexCourt found for client
Straube v. Wy. Workers' CompensationCourt found for client
Montoya v. Wy. Workers' CompensationCourt found for client
See all legal cases 
School nameMajorDegreeGraduated
University of Wyoming College of LawLawJD - Juris Doctor2001
University of Montana-WesternN/ABA - Bachelor of ArtsN/A