By January 1981, law enforcement had dubbed the robber the "I-5 Bandit", given his apparent preference for committing crimes along the Interstate 5 corridor. On January 8, he held up the same Vancouver gas station he had robbed in December, this time forcing a female attendant to expose her breasts after he emptied the cash register. Three days later, on January 11, he robbed a market in Eugene. The next day, January 12, he shot and wounded a female grocery clerk at a store in Sutherlin, Oregon.
On February 3, 1981, the bodies of Donna Eckard, 37, and her 14-year-old daughter were found together in a bed in their home at Mountain Gate, California, north of Redding. Each had been shot several times in the head. Forensic tests showed that the girl had also been sodomized. The same day in Redding, a female store clerk was kidnapped, raped and sodomized in a holdup. An identical crime was reported in Yreka on February 4, with the same man robbing an Ashland, Oregon motel that night.
Five days later in Corvallis, a man matching the I-5 Bandit's description held up a fabric store, molesting the clerk and her customer before he left. On February 12, 1981, robberies committed by a man matching the I-5 Bandit's description occurred in Vancouver, Olympia, and Bellevue, Washington. The Olympia and Bellevue incidents included three sexual assaults.
On March 5, 1981, Woodfield was brought into the Salem Police Department for an interrogation after Lisa Garcia positively identified him in a photo lineup. His apartment in Springfield, Oregon was subsequently searched two days later by warrant; inside, law enforcement discovered a spent .32 shell casing inside a racquetball bag, as well as a roll of tape that matched the tape found on the victims. On March 7, Woodfield was taken into custody after being positively identified by several Oregon robbery victims. On March 16, indictments for murder, rape, sodomy, attempted kidnapping, armed robbery, and illegal possession of firearms were initiated from various jurisdictions in Washington and Oregon.
In the summer of 1981, Woodfield was tried in Salem for the murder of Hull, as well as charges of sodomy and attempted murder (of Wilmot). Wilmot testified against him in the trial, and was key in the prosecution's conviction. Chris Van Dyke, son of actor Dick Van Dyke, was the Marion County, Oregon District Attorney at the time and prosecuted the case. Van Dyke would later characterize Woodfield as "the coldest, most detached defendant I've ever seen." On June 26, 1981, after three-and-a-half hours of deliberation, Woodfield was convicted on all counts and sentenced to life in prison plus 90 years.
In October 1981, a second trial was held in Benton County, in which Woodfield received sodomy and weapons charges tied to one of the attacks in a restaurant bathroom. Prior to this trial, his counsel attempted to move the trial from Willamette Valley; he felt that, owing to the publicity the case received, Woodfield would not get a fair trial there. The judge in the case denied counsel's request, along with a request to hypnotize a prosecution witness in an effort to determine if that witness had been influenced by the media coverage. Woodfield was convicted by the jury, and had an additional 35 years added to his already-instated sentence.
During the spring of 1980, Marsha Weatter (19) and Kathy Allen (18) vanished while hitch-hiking from the Spokane, Washington area to their hometown of Fairbanks, Alaska. Their bodies were found in May 1981. Suspected serial killer Martin Lee Sanders was later connected to their murders, but as of 2018 the case remains unsolved.