bada ba ba ba >>> once again, mystery in apartment 410. as "20/20" continues. >> reporter: sunset at eisenhower beach, along southern california's riviera coast. doesn't get much better than it's where community theater actors dan wozniak and rachel buffet plan to marry and then honeymoon, aboard a cruise ship, right after their musical "nine" closes in a couple of days. but there has been a hiccup in their matrimonial machinations. >> eyewitness news reporter eileen frere is live in long beach with new information on this grisly case. >> reporter: dan may not make the nuptials. has a previous, but sudden -- and more pressing -- engagement with police. he's performing the final act. after 14 hours at the police station, he is about to admit that he killed not just one innocent, but two, in a macabre plot worthy of pulp fiction. >> you said you wanted to talk to me. what's going on? >> i'm crazy and i did it. >> you did what? >> i killed julie and i killed sam. >> okay. all right. >> i killed them both. himself a pathological liar, in a downward spiral for two years, who couldn't bear to admit to his beautiful fiancee he had no job, no money,