On January 1, 1980, Bonin brutalized and strangled a 16-year-old Ontario youth named Michael Francis McDonald; his fully clothed body was found alongside Highway 71 in western San Bernardino County two days after his murder, although his body was not identified until March 24.
One Friday evening in March, 1980, Bonin offered a 17-year-old named William Ray Pugh a ride home as the pair left Fraser's residence. Within minutes of accepting the ride, Bonin asked Pugh whether he would like to engage in sex with him. Pugh later stated he panicked and stuttered upon hearing this question and, after sitting in silence for several minutes, attempted to leave the vehicle once Bonin had slowed the van at a stoplight. In response, Bonin wordlessly leaned across and grabbed Pugh by the collar, dragging him back into the passenger seat. According to Pugh, Bonin then confided in him that he enjoyed abducting young male hitchhikers on Friday and Saturday nights, whom he then restrained and abused before strangling them to death with their own T-shirts. In a matter-of-fact tone, Bonin then informed Pugh: "If you want to kill somebody, you should make a plan and find a place to dump the body before you even pick a victim." Bonin then informed Pugh he had not chosen to refrain from assaulting and killing him out of sentiment; he'd been spared because the pair had been seen leaving Fraser's party together. Pugh was driven to his home without being assaulted.
Nine days after the murder of King, Bonin invited an 18-year-old homeless drifter named James Michael Munro to move into the apartment he shared with his mother. Munro had been evicted from his family's home in his native Michigan in early 1980 and had been living rough on the streets of Hollywood for several weeks. As such, Munro readily accepted Bonin's accommodation offer. As had earlier been the case with Miley, Munro—a bisexual who preferred sexual relations with females—also began a consensual sexual relationship with Bonin. He also accepted a subsequent offer of employment at the Montebello delivery firm where Bonin worked. Munro later described his initial impression of Bonin as being "a good guy; really normal", although on the evening of June 1, Bonin abruptly informed Munro he wanted the two of them to abduct, rape, and kill a teenage hitchhiker.
By early 1980, the murders committed by the Freeway Killer were receiving considerable media attention, and a reward totaling $50,000 for information leading to the conviction of the perpetrator or perpetrators had been offered by leading gay rights activists. Bonin avidly collected newspaper clippings documenting his own manhunt.
By May 1980, Pugh had been arrested for auto theft, and was housed at the Los Padrinos Juvenile Courthouse. On May 29, Pugh overheard the details of the ongoing murders on a local radio broadcast and confided to a counselor his recognition of the perpetrator's modus operandi as being that described to him by Bonin two months previous. This counselor reported Pugh's suspicions to the police, who in turn relayed the information to an LAPD homicide sergeant named John St. John. Upon hearing the confidential tip from the counselor, St. John conducted an extensive interview with Pugh. Although Pugh withheld the fact that he had actually accompanied Bonin on one of his murders, the information he provided led St. John to deduce that Bonin may have indeed been the Freeway Killer. (McVicker had also contacted authorities by this time to report his suspicions that Bonin may be the perpetrator. His suspicions were not dismissed, but regarded as one of many public tips to be investigated.)
After nine days of surveillance, on June 11, 1980, police observed Bonin driving in a seemingly random manner throughout Hollywood, unsuccessfully attempting to lure five separate teenage boys into his van, before succeeding in luring a youth into his vehicle. The police followed Bonin until his van parked in a desolate parking lot close to the Hollywood Freeway, then discreetly approached the vehicle. Upon hearing muffled screams and banging sounds emanating from inside the van, these plainclothes officers forced their way into the vehicle; discovering Bonin in the act of raping a 17-year-old Orange County runaway named Harold Eugene Tate, whom he had handcuffed and bound.
Butts was brought before Orange County Municipal Court Judge Richard Orozco on November 14, 1980. On this date, he was formally charged with participating in three further murders committed in this county. His trial was scheduled for July 27, 1981.
Bonin was cleared of the sodomy and murder of King because he had led police to the body of the victim in December 1980, with the agreement that his leading police to the body could not be used against him in court, and therefore the prosecutors had discussed King's disappearance at the trial, but not the discovery of his body; he was cleared of the charges of mayhem and murder against Lundgren because, according to López, he had strenuously denied committing this particular killing in the interviews he had granted to him.