Season 4

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.

Three women go missing while vacationing in Yosemite National Park.

In April 1992, an elderly couple is found dead in the trunk of their car at their home in upscale Toronto.

The largest police investigation of the decade was mounted to catch a ruthless sniper who terrorized residents of the Washington, D.C. area.

Investigators called to a farmer's field find an unidentified burned corpse and use state-of-the-art forensics to find the murder scene.

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.