S4E1 - Hog Trail
A serial killer is on the loose in central Florida and all police have to go on are the bodies of four mutilated, severely decomposed men.
May 4, 2007, midnight
S4E2 - Yosemite
Three women go missing while vacationing in Yosemite National Park.
May 11, 2007, midnight
S4E3 - House Hermit
In April 1992, an elderly couple is found dead in the trunk of their car at their home in upscale Toronto.
May 18, 2007, midnight
S4E4 - Sniper
The largest police investigation of the decade was mounted to catch a ruthless sniper who terrorized residents of the Washington, D.C. area.
May 25, 2007, midnight
S4E5 - Dead Man's Hollow
Investigators called to a farmer's field find an unidentified burned corpse and use state-of-the-art forensics to find the murder scene.
June 1, 2007, midnight
S4E6 - Olympic Bomber
The 1996 Summer Olympics in Atlanta, Georgia are rocked by a massive pipe bomb explosion. A woman is killed and hundreds injured. Subsequent bombs at an abortion clinic and a gay bar show a similar M.O., and increasing refinement. Police have no clue who is behind the bombings until they receive a letter signed by 'The Army of God', an anti-abortion, anti-gay, white supremacist group.
June 1, 2007, midnight