Catherine DiMauro, a 31-year-old white female from Newark, Delaware, was last seen late on the night of June 28, 1988, walking along U.S. Route 40. At about 6:25 a.m. the next morning, construction workers discovered the 31-year-old's nude body at a residential construction site near Glasgow. Investigators noted extensive trauma consistent with a brutal assault but no evidence of sexual assault.
Crucially, her body was coated in distinctive blue carpet fibers—and a piece of duct tape was found tangled in her hair—details that would soon anchor the investigation.
Detectives quickly realized the 31-year-old's killing resembled the November 1987 slaying of Shirley Ellis, concluding a serial predator was hunting women near Route 40. A multi-agency task force formed with FBI profilers, and undercover female officers posed as sex workers along the corridor. The blue fibers taken from the 31-year-old's body became the investigation's lodestar; when an undercover officer later examined the floor of a blue Ford panel van during a decoy operation, she furtively plucked matching blue fibers and recorded the license plate. The van belonged to Steven Brian Pennell, a 31-year-old Delaware electrician with no criminal record.
On November 29, 1988, exactly one year after Ellis was found, police arrested Pennell and charged him with first-degree murder in the slaying of 31-year-old Catherine DiMauro of Newark. A subsequent search of his blue Ford van revealed a cache that prosecutors dubbed a “torture kit,” along with carpet fibers, hair, blood, and duct tape consistent with what was recovered from the 31-year-old's body. The case against him also made pioneering use of forensic DNA: testing linked bloodstains to the victim with a population-frequency estimate calculated within the Caucasian reference group, a point cited during pretrial litigation.
In November 1989, a jury convicted Pennell of murdering Ellis and 31-year-old Catherine DiMauro but deadlocked on the charge involving Michelle Gordon. Pennell initially received two life sentences; prosecutors later pursued additional counts, and Pennell ultimately pleaded no contest to two more murders. He asked the court to sentence him to death, and on March 14, 1992, he was executed by lethal injection—the first person executed in Delaware in 46 years. The blue fibers that clung to the 31-year-old's body, the duct tape in her hair, and the grim contents of the van had traced a clear line back to the man who prowled Route 40.
