04/29/2025
Anatomy of a Murder Investigation —
Stellar Police Work Leads To Arrest of Three Suspects
PARKER COUNTY— PCT has received a Probable Cause Affidavit on Trin Lawrence McKnight, Barrett Copeland, and Dennis Craig Alexander in connection with a triple homicide. All three men are charged with capital murder.
Three bodies were discovered on April 24 in northern Hood County near Lake Country Acres. The remains were found adjacent to a water-filled creek. The bodies were identified as a 44-year-old woman, a 42-year-old man, and a 55-year-old man.
According to the Probable Cause Affidavit, Joshua Vaughn, a peace officer with the Parker County Sheriff's Office in the Criminal Investigations Division, stated that on April 21, 2025, at approximately 6:38 p.m., he was dispatched to 132 Myrtle Lane in Granbury, Parker County, Texas, for a missing persons investigation.
At the residence, the deputy spoke with a woman who stated that the previous day, she had gone to the residence, where her aunt, Tiffany Ann Williams, lived. She reported that Tiffany lived with two others, including her romantic partner, David Dewayne Walker, a Black male, and an associate of theirs named Robbie Allen Head, a white male. She knocked on the door but got no answer. She also called Tiffany Williams but got no answer.
On April 21, she returned to the residence to see if anyone was home and noticed that the Ring doorbell security camera had gone missing since the previous day. Once again, she got no response. She entered the residence through the back door and found the house in disarray. No one was inside, but their vehicle was still parked in the driveway. She called Tiffany Williams and David Walker but the numbers she dialed went to voicemail. She reported the disappearance of Williams and the others to the Parker County Sheriff's Office the same day. She last spoke to Tiffany on Saturday, April 19 2025, when Tiffany invited her over for Easter dinner.
On April 22, 2025 Joshua Vaughn's search warrant was granted for 132 Myrtle Drive. Inside the residence, investigators located large amounts of blood, along with evidence of the discharge of a firearm or fi****ms, such as spent rounds casing, projectiles, and defects (holes in the wall). The victim's vehicle was parked at the residence. While searching the premises, investigators observed what appeared to be consistent with a bloodletting event in the back seat and back hatch of the vehicle. The vehicle was towed to the Parker County Sheriff's Office where it was secured.
On April 24, 2025, the deceased bodies of three individuals matching the appearance of Tiffany Williams, Robbie Head, and David Walker were found in a creek in Hood County, approximately a mile from their residence. The individuals had injuries consistent with gunshot wounds. There was a cloth wrapped around the Black male's torso covering his head and chest. There was duct tape wrapped around the fabric around his neck. The white male was also covered in fabric. On April 28, 2025, the Tarrant County Medical Examiner and Justice of the Peace concluded that all three were deceased due to homicidal violence caused by gunshot wounds.
On April 25, 2025, PCSO crime scene analyst H. Huffman and Texas Ranger Job Espinoza and Bo Bowden processed the vehicle for evidence. While processing the vehicle, they observed a fingerprint on the underside of the locking mechanism. Certified crime scene investigator Tatiana Hernandez compared the lifted latent fingerprint against a copy of McKnight's ten-print card from Tarrant County jail. CCSI Hernandez determined that the source of the latent fingerprint is consistent without an unexplained dissimilarity to McKnight's left middle finger. CCSI Hernandez located 17 points of individual characteristics within the latent print synonymous with the known left middle finger of McKnight. CCSA Heather Huffman performed a blind verification and verified that McKnight's left middle finger was the source of the lifted latent print. Regina Alcantar with the Johnson County Sheriff's office performed a second blind verification to confirm the previous findings.
On April 27, 2025 Joshua Vaughn and PSCO investigators spoke to McKnight at his uncle's house in Lake Country Acres. Vaughn asked McKnight what he had heard about the murders and he stated he had heard there were three murders and the bodies were found, but he hadn't been in the neighborhood much recently.
On April 28, 2025, McKnight was arrested for a Tarrant County warrant. Vaughn and Ranger Espinoza interviewed McKnight in a custodial interview. McKnight was read his Miranda rights, which he stated he understood and was willing to speak with investigators. During the course of the interview, McKnight stated he was at Williams and Walker's residence the night they were murdered. McKnight stated that he and Barrett Copeland met Dennis Alexander and another unknown white male on the corner of Lois Circle and Myrtle Lane. They agreed to go to Williams and Walker's house and rob them. While in the house, Dennis held Williams and Walker at gunpoint while the other two searched the house for drugs and money. Robbie Head then came into the house and Dennis held him at gunpoint also. McKnight stated that Dennis then shot Williams, Walker and Head in the kitchen area of the residence. Dennis then handed McKnight the victim's car keys and told him to get the car ready. Then, Dennis and the other male wrapped and loaded the deceased bodies of the victims into the victim's car. McKnight got in the front passenger seat of the vehicle. While Dennis got in the backseat and the other male drove. Copeland was instructed to stay at the house. They then drove to the creek to dispose of the bodies. McKnight stated he ran away from the vehicle toward Lake Country Acres before the bodies were taken out of the vehicle. McKnight ran back to his house on Lois Circle.
The next day, Dennis came to his house, gave him the keys to Williams' vehicle along with a bag of ammunition, and told him to get rid of it. McKnight's statements were consistent with evidence found at the crime scene. On the same date, Parker County investigators and Texas Rangers conducted a search warrant of McKnight and Copeland's residence. At the residence, they located the keys to the victim's vehicle, along with a bag of ammunition.
They Just Keep Coming —
New Update as Fourth Suspect is Apprehended in Triple Homicide
PCT has received word that a fourth suspect, Michael Dylan Lee Morris, 18, has been arrested and charged with Tampering/Fabricating Physical Evidence w/ Intent to Impair Human Co**se, Abuse of Co**se w/o Legal Authority, and Failure to Report Felony w/ Serious Bodily Injury or Death Results.
Morris was previously arrested on May 22, 2024, for Assault Causes Bodily Injury in Parker County. That case is still pending in CCL2, with Judge Lynn Johnson presiding. On March 07, 2025, the then 17-year-old Morris, agreed to a Pretrial Diversion Program.
This arrest may result in Morris' Pretrial Diversion Program ending in a significant failure.
Additionally, PCT has discovered that one of the three murder suspects, Barrett Copeland, 19, was arrested March 26, 2025, and charged with Theft of Firearm. Copeland lived 0.7mi from the victims' residence.
Dennis Alexander was previously arrested on a warrant out of Smith Co. for Contempt Child Support Division in 2018, and again in 2021 on a Parker Co. warrant for Motion to Revoke/Contempt Child Support Division. At the time of those arrests, Alexander gave his address as being on Lake Country Dr., with just one house between he and fellow capital murder suspect Trin McKnight, and just 0.3 miles from the victims' residence. However, for the Capital Murder of Multiple Persons arrest, Alexander gave a home address 87 miles away in Brown Co.
PCT will continue to update as new details unfold.
