• Tuesday morning — Family members say Mark Hacking was checked into a psychiatric unit at the University of Utah Medical Center.

• Thousands of volunteers join the search for Lori Hacking in the Memory Grove/City Creek Canyon area. Their numbers will fluctuate over the coming days.

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WEDNESDAY, JULY 21

• Mark Hacking becomes a person of interest after it is discovered that he had deceived his family for two years, leading them to believe he graduated from the University of Utah and was accepted to medical school in North Carolina.

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SATURDAY, JULY 23

• The search for Lori Hacking leads to a municipal landfill and includes the use of cadaver dogs, police confirm.

• A pathology lab begins testing a sample of a brown, protein-rich liquid that a neighbor of the Hackings found at the bottom of his trash bin on Monday after collection rounds, Baird says.

• Mark Hacking remains hospitalized, with family saying the date of his release will be determined by physicians.

• Sources confirm to the Deseret Morning News that a blood-stained knife with hair attached to it was included in evidence seized from the Hacking home.

• Police evidence technicians collect a clump of hair from a Dumpster at a Chevron gas station at the corner of 2100 South and 300 West.

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E-mail: preavy@desnews.com; jdobner@desnews.com