Criminal Investigations

Division Responsibilities & Services

The Criminal Investigations Division (CID) is one of the many crucial yet rarely seen divisions of the Murphy Police Department. As the title suggest, CID is tasked with the thorough yet timely investigation of crimes committed within the city limits of Murphy. In addition to performing crime scene investigations, CID also handles the transfer of evidence to external labs for processing as well as prepping cases for prosecution. Detectives are available to answer questions to the public by appointment only.


Note: All initial reports of crime must go through a patrol officer first.  Case updates can be obtained by contacting the assigned detective.

Division Supervision


Aaron McCarty,  LieutenantAaron McCarty-MPD

Lieutenant McCarty joined the Murphy Police Department in April of 2011 as a Police Officer. Before coming to Murphy PD, he served as a Deputy Constable in Dallas County. Lieutenant McCarty attended the Tarrant County College Police Academy and graduated as a Texas Peace Officer in 2002.  Lieutenant McCarty has served in various police divisions during his law enforcement career including, Patrol Services, Traffic Enforcement, Advanced Collision Investigation, Civil Process Service and Education, Warrant Service Officer, Sergeant and Police Supervisor.

Lieutenant McCarty holds a Master Peace Officer Certification from TCOLE, the State of Texas governing board for Law Enforcement Professionals. He is an Advanced Collision Reconstruction Investigator, Law Enforcement Driving Instructor, TCOLE Police Instructor, Field Training Lieutenant, TCOLE Training Coordinator and Mental Health Peace Officer. Lieutenant McCarty was an Adjunct Professor with TEEX, a subdivision of Texas A&M University where he instructed Collision Reconstruction.

Lieutenant McCarty is originally from Keller, Texas. He graduated from Keller High School and holds a Bachelor of Science in Criminal Justice from Lamar University. He is a graduate of the 95th class of the LEMIT Leadership Command College at Sam Houston University.

In his personal time Lieutenant McCarty enjoys camping, boating and spending time with his family. Lieutenant McCarty has been selected as both Officer of the Year and Supervisor of the Year while at the Murphy Police Department.