history of the united states. >> profilers tell us they've learned some important lessons from the gary ridgways behavior was different from other serial killers indicating that one profile doesn't fit all. keeping that in mind may help police catch other serial killers sooner. >>> i'm stone phillips, and for all of us at nbc news, good night. don't worry, lucky, these wheat thins crunch stix will save us. [ crunch ] look! [ male announcer ] wheat thins crunch stix. try our new flavors. for strong bones i take calcium. but my doctor told me that most calcium supplements... aren't absorbed properly unless taken with food. he recommended citracal. it's different -- it's calcium citrate so it can be absorbed with or without food. citracal. ♪ ♪ ♪ ♪ ♪ ♪ [ male announcer ] with the most advanced engine in its class, 50 horsepower, dual overhead cams and fierce acceleration the gator xuv 825i will shatter your expectations. discover the fastest most powerful gator yet, at johndeere.com/gator.

jose malvar and rebecca guarde weren't the only ones to tell the green river task force about gary ridgway. in 1984 and again in '86, two other prostitutes told them they thought ridgway was connected to the disappearance of two of their friends who were working the streets. but it took until 1987 before detectives launched an investigation. they interviewed ridgway's former girlfriends and wives. and the picture that emerged was that of a sexually aggressive young man who had trouble with relationships from early on. police learned that gary ridgway was already 20 when he graduated from high school in 1969. that he joined the navy and got married that same summer. he and his wife moved to san diego. by the time gary returned from a six-month tour of duty cruise, his wife was romantically involved with another man. according to police documents, he accused her of being a whore and giving him sexually transmitted diseases, diseases navy records show he had before going to sea. ridgway acquaintances said he often complained that he gotten venereal diseases from prostitutes. his wife said he