Lubahn was last seen at her residence in the 17600 block of Cranbrook Avenue in Torrance, California at approximately 12:00 a.m. on March 31, 1981. Her husband of ten years, Michael Clark (called Michael Clark Lubahn at the time; he later dropped his last name), stated he went to sleep at that time, and she was gone when he woke up at approximately 4:00 or 5:00 a.m. She has never been heard from again. On April 6, her red 1979 Audi Fox was found abandoned at the Red Onion Restaurant in Redondo Beach, California. The restaurant manager stated it had been there all week.

Clark stated that on the night of her disappearance, he and Lubahn argued and she said she wanted to sell the house. He suggested Lubahn had left on her own because she wanted time to herself. He said he didn't report her disappearance for several days because of this theory. He said after Lubahn's disappearance, someone came to the house while everyone was out, went through the mail and took some clothing. He also claimed he got hang-up calls on the holidays. Clark divorced Lubahn in 1984, three years after she was last seen. He later remarried, then got a second divorce twenty years later.

Both Lubahn and Clark attended North High School and married just after graduation. They had two young children in 1981, and Lubahn was studying architecture at El Camino College. She left all her personal belongings behind at home, shenever picked up her last two paychecks from her part-time job, and she hasn't used her credit cards or Social Security number since 1981. Authorities initially thought she had left of her own accord, although her family stated she would never have abandoned her children.

In April 2011, Clark was arrested and charged with Lubahn's murder. Photos of him are posted below this case summary. Authorities haven't detailed the evidence they have against him. He is awaiting trial. Foul play is suspected in Lubahn's disappearance due to the circumstances involved.

Left: Michael Clark, circa 1981;
Right: Michael Clark in 2011