Name	Known for
Sarah Armstrong-Brown Blue Uniform Cop Blue Uniform Cop See fewer	The Middle Distance (2015)
Mark Bilkovic Self - Former Assistant Prosecutor, Lake Orion Self - Former Assistant Prosecutor, Lake Orion See fewer	Diabolical (2018)
Kevin Boyd Sr. Self (archive footage) Self (archive footage) See fewer
Matthew Courson Young Kevin 2020 Young Kevin 2020 See fewer	Destination Marfa (2021)
Karen Davis Self - Lynn's Friend Self - Lynn's Friend See fewer	Diabolical (2018)
Steve Garfanti Uncle Wayne Uncle Wayne See fewer	Greatest Mysteries (2013)
Devin Bailey Griffin Judy Kaminski Judy Kaminski See fewer	Diabolical (2018)
Lynette Heide Self - Kevin Sr.'s Sister Self - Kevin Sr.'s Sister See fewer	Diabolical (2018)
Ross Huguet Narrator Narrator See fewer	Building Off the Grid: Big Sky Ranch (2016)
Judy Kaminski Self (archive footage) Self (archive footage) See fewer
Donald Lucarelli Self - Kevin Sr.'s Friend Self - Kevin Sr.'s Friend See fewer	Diabolical (2018)
Patrick Miles Self - Det. Sgt., Oakland County Sheriff's Office (ret.) Self - Det. Sgt., Oakland County Sheriff's Office (ret.) See fewer	Diabolical (2018)
Jacob Moran Young Kevin Jr. Young Kevin Jr. See fewer	The Black Phone (2021)
Jerry Narsh Self - Lake Orion Chief of Police (ret.) Self - Lake Orion Chief of Police (ret.) See fewer	Cupid's Christmas (2022)
Jayson Rumball Self - Kevin Sr.'s Employee Self - Kevin Sr.'s Employee See fewer	Diabolical (2018)