He was investigated by police in the immediate aftermath of the murder, not least because he drove a blue Vauxhall Viva - the same type of car which had been seen at the farm on the afternoon of the murder. Witnesses also said that the driver of the car was a uniformed man. Spencer had a shotgun licence and was regularly allowed to shoot at Yew Tree Farm. However, he was eliminated from police inquiries within a few months after the arrest of the four other suspects. Shortly afterwards, Spencer shot dead 70-year-old Hubert Wilkes at neighbouring Holloway Farm. Like Carl, Hubert Wilkes had been shot while sitting on a sofa. Spencer was imprisoned for life in 1980 and served 15 years before being paroled in 1995. Spencer is featured in a book, "Scapegoat for Murder: The Truth About the Killing of Carl Bridgewater" (D&B Publishing), written by true crime author, Simon W. Golding. The author invited criminologist David Wilson to interview Spencer, and in June 2016, Channel 4 screened a television documentary, "Interview with a Murderer". In the course of the "interview of the year", Spencer's daughter revealed that she felt that her father was at Yew Tree Farm on the day of Carl's killing "and possibly saw something". An ambulance station secretary (who was also a friend) who had provided the "cast iron" alibi that he had been "at work all day", admitted that she could not be sure that Spencer had not left at some point. Wilson, in his final meeting with Spencer, told him that he saw through Spencer's "kindly old grandfather schtick", adding that a P-scan test indicated Spencer was a manipulative and callous psychopath. The documentary concluded with Wilson interviewing Spencer's former wife, who had not spoken publicly before. She said that the day after Carl's murder, Spencer told her he was disposing of his shotgun. She added that, Spencer having chosen to revive the issue to protest his innocence, it seemed likely that the police would reopen the case.