Mark Hacking directed a relative to give police new information about his wife's disappearance that has police turning again to a municipal landfill, detectives said Sunday.

Authorities investigating the case were surprised by the family's request that volunteers stop searching for Lori Hacking based on a new detail from her husband.

The statement released late Saturday by the families of Mark and Lori Hacking did not say what Mark Hacking had told them.

Authorities would say only that the relative provided "additional substantive new information," detective Dwayne Baird said. He declined to comment further.

Baird said police would renew a search at a municipal landfill. Cadaver dogs would not be available until Friday, however, when the all-night searching can begin, he said.

Mark Hacking's parents, Douglas and Janet Hacking, declined to comment Sunday, as did his lawyer.

Lori Hacking, 27, has been missing since July 19, when her husband told authorities that she did not return from a morning jog.

Lori Hacking's father, Eraldo Soares, said late Saturday that he was unaware of any new information about his daughter.

The families called off the organized search for Lori earlier this week, a decision they said was made out of concern for the volunteers' safety. The search was in neighborhoods, industrial areas and canyons near the park where Lori Hacking was said to have been jogging the morning she was reported missing.

Since that day, Mark Hacking's credibility has crumbled amid revelations that he lied to his wife about enrolling at medical school in North Carolina and about graduating from the University of Utah.

The day after Hacking reported his wife missing, he was taken to a psychiatric ward after running around at night naked outside a motel where he had taken a room.

Investigators focused on Mark Hacking, 28, after learning he was at a store buying a mattress just before reporting his wife missing. Authorities were later seen removing a box spring from the couple's apartment. Investigators have declined to confirm reports that they found a mattress in a nearby trash bin.

Hacking has not been charged.

Relatives of Lori Hacking, with husband Mark, said new information from Mark prompted them to have volunteers stop searching for her.