On December 20, 1986, 30-year-old Greg Greenhalgh was found stabbed to death on a punctured water bed inside his Beacon Street home in Shasta Lake, California. The killing was described as brutal and left his family devastated; his mother Shirley Greenhalgh later said she thinks about him every day.

The case remained unsolved for years. In 1995 detectives arrested 42-year-old Thomas Elmer Brewster, a felon with a history of violent crimes and drug abuse, but after two years in jail he was exonerated at his 1997 trial when DNA from a semen-stained blouse excluded him. Brewster later reached a $360,000 federal settlement alleging detectives coached a sexual-assault victim to misidentify him.

The murder of Greg Greenhalgh remains open and is listed among many unsolved homicides in the region. If anyone knew Greg, his movements in Shasta Lake in December 1986, or has information relevant to this case, please come forward.