The Pearland Investigation: How an Unsolved Triple Homicide Became Linked to the Houston Bayou Mystery

For years, the Pearland case sat in a dusty evidence room—a triple homicide so brutal and puzzling that veteran detectives still referred to it simply as "the house."

Police officers secure the crime scene outside of the Pearland-area residence.

By Alexa Bickerwood

Reporting from Huntsville, Texas, USA

June 26, 2026 Updated 1:43 a.m. ET

On the morning of September 14, 2017, Pearland police officers responded to a welfare check at a modest two-story home near the city's western edge. A concerned employer reported that Mark Hollis, 42, had failed to show up for work for three consecutive days. When officers entered the residence, they discovered a scene that would haunt investigators for years. Inside were the bodies of Hollis, his girlfriend Angela Ruiz, 38, and Ruiz's adult son Miguel Ruiz, 19.

There were no signs of forced entry, no obvious robbery, and no known enemies. “There was no clear motive,” said one investigator. “The killings appeared personal.”

Detectives initially believed the murders were the result of a domestic dispute or drug-related violence. However, as investigators reconstructed the victims' final days, neither theory held up.

Pearland Police Department's headquarters, located west of the city's center.

All three victims lived relatively quiet lives, and investigators found little in their backgrounds to suggest they were being targeted. Cell phone records revealed no threatening communications, financial records showed no unusual activity, and neighbors reported hearing nothing suspicious before the murders. What made the case especially troubling was the condition of the crime scene itself. The killer appeared organized, leaving behind few clues while taking deliberate steps to avoid detection.

Evidence suggested the offender had spent considerable time inside the residence after the murders. Several items were moved. Portions of the home had been cleaned. Yet investigators found no fingerprints, no DNA profile suitable for comparison, and no surveillance footage.

As years passed, the case grew cold.

Nearly six years later, the Pearland file resurfaced. Detectives examining a series of unexplained deaths connected to Houston-area bayous had begun reviewing old homicide investigations throughout Harris, Brazoria, and Fort Bend counties.

One name kept appearing: Carl Clint Ashworth.

Booking photo of Carl Clint Ashworth after his 1997 arrest for public intoxication.

At the time of the Pearland murders, Ashworth worked at a local recreation center and occasionally performed maintenance work for apartment complexes throughout the region.

Investigators discovered that Ashworth had crossed paths with at least one of the victims several months before the murders. The connection was minor, but it was enough to draw investigators' attention.

As detectives dug deeper, they identified what appeared to be a disturbing pattern.

Several men later found dead in Houston-area waterways had either lived near locations frequented by Ashworth, worked with people connected to him, or visited businesses where he was known to spend time.

Aerial view of Houston's bayou system winding beneath highways and rail lines.

None of the connections were strong enough to establish probable cause. Collectively, however, they raised alarms.

One retired investigator would later state there were "too many coincidences involving the same individual."

The investigation took a dramatic turn when authorities received an anonymous tip claiming Ashworth had privately discussed details of the Pearland murders that were never released publicly.

According to the tipster, Ashworth allegedly referenced the specific location of one victim's body in the home. This information was not publicly available. Additionally, he allegedly described the victim’s wound pattern and referenced an item that had been removed from the residence.

All details matched information contained in the original case file. Unfortunately, the source later refused to cooperate further. Without corroboration, prosecutors could not act.

Despite years of investigation, authorities never obtained the evidence necessary to charge Ashworth. Investigators admitted there was no murder weapon, no eyewitness, and no DNA match. “We needed a confession,” said one investigator. “And the suspect was not cooperative.”

Detectives remained divided. Some believed Ashworth was merely an unfortunate coincidence surrounded by rumor and speculation. Others believed he was responsible for far more crimes than anyone realized.

Today, the Pearland murders remain officially unsolved. For investigators working the Houston Bayou deaths, the case remains important because it may represent the earliest known incident involving a suspect who repeatedly surfaced in later investigations.

Police officers search a Houston bayou beneath a busy freeway interchange.

Whether Carl Clint Ashworth is a serial killer, an innocent man caught in a web of suspicion, or something in between remains the central mystery of the Houston Bayou Bodies investigation.

And somewhere inside the aging Pearland case file may be the answer that ties everything together.

Editor's Note: The allegations described in this article are drawn from court filings and statements by investigators. The charges remain allegations, and the defendant is presumed innocent unless and until proven guilty in a court of law.