SACRAMENTO, California (AP) — More than three decades after his trail went cold, one of California's most prolific serial killers and rapists was caught by using online genealogical sites to find a DNA match, prosecutors said Thursday.

Investigators compared the DNA collected from a crime scene of the Golden State Killer to online genetic profiles and found a match: a relative of the man police have identified as Joseph James DeAngelo, 72, who was arrested at his suburban Sacramento home on Tuesday.

Authorities didn't give the name of the site, one of many that allows people to send in their D...