Eugene Zapata was arrested on Monday for allegedly murdering his wife Jean Zapata, who disappeared from their East Side Madison home 30 years ago.

The investigation into what happened Jean Zapata was dormant for years. The 36-year-old Madison woman and mother of three disappeared in 1976, but the case only returned to the spotlight in December 2004.

Here is a timeline in the investigation:

December 2004: Cadaver Dogs Search Former Home
Two cadaver dogs searching the basement of Jean Zapata's former home and indicated hits of human remains. A human hair was taken from the site, police said.
August 2005: Cadaver Dogs Search Storage Locker
Two cadaver dogs separately indicated hits of decomposing human remains at a Sun Prairie storage locker that Eugene Zapata had rented.
August 2005: Cadaver Dogs Search Juneau County Lot
Police also used cadaver dogs to search a 4-acre lot owned by Eugene Zapata in Juneau County.
December 2005: Police Call Case "Foul Play"
Madison police officially called the case "foul play" and named Eugene Zapata their one and only suspect.
February 2006: Eugene Zapata Denies Connection To Wife's Disappearance
In a telephone interview with WISC-TV from Henderson, Nev., Eugene Zapata denied any connection to his wife's disappearance.
March 2006: Police Search Juneau County Landfill
Madison police conducted a week-long search of the Juneau County land-fill near Mauston. They said that they are searching for Jean Zapata's remains and containers that they believe belonged to Eugene Zapata.
August 2006: Eugene Zapata Arrested For Murder
Authorities in Nevada arrested Eugene Zapata for murder in connection to his wife's disappearance.